Battle for Dream Island: The Power of Two

The 40 contestants that transferred to the new season are debating on whether they should reconsider going back, though they eventually agree that BFB is no longer worth competing in since Four changed the prize twice. Two appears and reveals Winner as the most-voted debuter to join the game. However, this makes the number of contestants 41, making equal teams impossible. Since the second most-voted is Nonexisty, who Two does not count as a real contestant, Two gets the third most-voted, Price Tag, to join the game instead to make the cast 42. Six teams are formed, being The Strongest Team on Earth,^[a] Death P.A.C.T. Again,^[b] Are You Okay,^[c] Team8s,^[d] The S^[e] and Just Not.^[f] The challenge is to get to the top of the roof of Two's hotel. Death P.A.C.T. Again loses.

Profily helps Teardrop attempt to join the show after BFB ended. Teardrop is allowed by Two to join, and is placed on a solo team (aptly named "Teardrop") due to her late debut. Cake at Stake utilizes the voting format seen in Battle for B.F.B., and Pie is the first to be eliminated, and is sent by Two to an upside-down city realm. Since Two cannot recover contestants themselves, they order the Wireless Recovery Center (WRC), which looks and functions similarly to the HPRC. The challenge is to take blocks and stack them as high as possible, and the team with the lowest stack will lose, which ends up being The Strongest Team on Earth.

Foldy is eliminated. Two reveals why two year-long hiatuses occurred, as they were busy making an "Atwosment Park". Realizing the park is empty, Two challenges the teams to make something for the park. Due to two teams (Team8s and The S) failing, and seeing how long it is taking to have another contest, Two decides to speed the game up by having two teams up for elimination at a time as opposed to one.

In the newly-built "Atwosment Park", Saw and Cloudy are the first to be eliminated under the new double-elimination format. In memory of Saw, her team gathers around a "funny plant" she liked, until it is suddenly destroyed. The "funny plant" is then revealed to be a critically endangered species on the verge of extinction, and the teams are tasked to protect the seven remaining specimens in different regions of the world. Just Not and Death P.A.C.T. Again lose. Despite their efforts, the "funny plant" goes extinct anyway due to a series of events that destroy the other teams' specimens.

Naily and Remote are eliminated. Two buys some new plates, but they are flung into the Goiky Canal. The teams are challenged to traverse the waters and each retrieve a plate to win immunity. The Strongest Team on Earth and Are You Okay fail to do so.

Eggy and Fries are eliminated. Four and X return as chefs in Two's hotel, but do not allow them to eat their food, so the teams are challenged to make dinner for Two. The S and Death P.A.C.T. Again lose the challenge.

Clock and Lightning are eliminated, and while Clock is allowed to remain a spectator due to an unresolved conflict with Winner, Lightning is so angered by his elimination that he unleashes a thunderstorm, destroying seven monuments across Goiky, including the moon. Two then decides that the challenge is to repair the monuments damaged by Lightning, with each team assigned to a different one. Conflict arises within Death P.A.C.T. Again as Fanny questions if their death-prevention goal is worthwhile. Robot Flower has Basketball overwrite her personality to that of Flower's, but her personality becomes that of Flower from the first season after Just Not's strategy inadvertently causes a blackout during the download, resulting in Robot Flower going on a violent rampage against all the failed debutants in the hotel. Just Not and The S lose the challenge.

Cake and Rocky are eliminated, with Rocky barfing into a volcano before Two sends him away. The teams are challenged to remain on a balance beam that was repaired in the last challenge, an homage to the first episode of BFDI. Teardrop falls ill from absorbing Barf Bag's vomit, so Snowball and Grassy volunteer to help her. Are You Okay and Team8s lose.

Barf Bag zombifies after being re-filled with vomit-infused lava. A zombie apocalypse spreads, infecting many of the contestants, Puffball and Coiny when they get eliminated, the failed debuters, and Two. The contestants are tasked to prevent their team from getting infected, and the two teams with the most members killed/infected are up for elimination. Due to poor wireless connection between Two and Just Not in Gelatin's Steakhouse, Pillow misinterprets the challenge as having to kill her teammates, not protect them, and causes her team to lose. Teardrop, who had sacrificed herself during the challenge to produce an antidote, is automatically eliminated due to her still being on a solo team. In the episode's stinger, the crack in the moon created by Lightning breaks into a giant hole, and One, another Algebralien, emerges from the hole he made.

Nickel is eliminated. Everyone is irritable from the outbreak, which annoys Two, so they make the challenge to enter a teammate's nightmare and help them face their fears as a "bonding experience". Fanny and Black Hole discuss the motives of Death P.A.C.T.; Winner explains their past, revealing that they and Loser used to be a performing duo until they eventually drifted apart due to their differing opinions of handling their fame, and makes up with Clock; and Price Tag reaches out to a lonely Book and they become friends. Just Not and The Strongest Team on Earth lose.

The EXIT's inhabitants try to devise a new plan to escape Four by getting resources they need from the Fourest and splitting up to make the plan easier. They spend years getting said resources as an attempt to escape Four. They eventually escape Four, but then Two makes them work in the hotel's kitchens in an attempt to compromise with Four's insistence of putting them back in the EXIT. The "EXITors", angered by this, try to escape. Later, Purple Face gets trapped inside Four trying to "save" the "EXITors" after learning of their entrapment, not realizing they already left.

Book and Price Tag climb Bell's string and discover that it passes through an area in the sky called Band Land. One kidnaps Bomby and Bell after their eliminations and shuffles the remaining contestants into four new teams: Death P.A.C.T. Yet Again,^[g] Team 2,^[h] "BAGGED"^[i] and CloudYAY.^[j] The new teams are tasked to fill their respective pits with whatever they can find, and CloudYAY and "BAGGED" lose. One starts to write deals with contestants, and Basketball begins to follow her as she grows suspicious. The "EXITors" manage to escape the kitchen, and Two allows one of them to join TPOT. In a post-credits scene, Basketball is noticed and One kidnaps her.

One continues to meddle in the game, creating a massive hurricane that rages through Goiky (forcing everyone into the hotel in the process), and altering the whiteboard so that two "EXITors" can join instead of one, those being Pencil and Liy, the latter of whom would have joined by default. The two join CloudYAY and "BAGGED", respectively, while the remaining "EXITors" are thrown into the storm and swept away to various parts of the world, with Roboty crashing back into the hotel. With Barf Bag and Needle eliminated (and kidnapped by One as well), the challenge is for each team to stop a specific part of the chaos from reaching Two and disturbing their sleep. Robot Flower's rage reaches a climax, and Fanny and Tennis Ball work together to reset her, though they only manage to shut her down; Basketball is ultimately coerced into signing a contract to bring Robot Flower's original personality back. The four have Black Hole suck up the storm to end the hurricane, and Team 2 and Death P.A.C.T. Yet Again lose. Meanwhile, Match is carried by the storm to the former Battle for B.F.B. contest grounds where she reunites with Bubble and Ruby, while Firey discovers that Leafy had gone missing during the hurricane.

The contestants begin repairing the damage caused by the hurricane. TPOT's failed debuters host Cake at Stake while Two is busy cleaning up the hotel. After Eraser and Gaty's eliminations, Two is distraught by the latter's elimination, and instead allows Gaty to work in Four and X's kitchen. The challenge is to capture one of two flags; either from atop a snowy mountain, or atop a volcano. Three of four teams go for the snowy mountain. Firey Jr. takes shelther from the immense cold in a cabin, falls victim to the fighting between Team 2 and "BAGGED", and is subsequently killed when the cabin collapses. Once the snowy flag is captured by Grassy, Death P.A.C.T. Yet Again, Team 2, and "BAGGED" attempt to team up to stop CloudYAY from capturing the volcano flag. Death P.A.C.T. Yet Again and "BAGGED" lose, with everyone (including Firey Jr.) dead, except for Black Hole and Winner. In the stinger, Match is blown away to the Pillary Ruins.

The failed debuters discover the Yoylite from "Start the Shift" and learn of its time-traveling capabilities. They are transported to different periods in the past, which results in alterations to the series' timeline, and a large crack in the sky, known as the "Rift", is formed as a result. With Basketball and Robot Flower eliminated, Black Hole tries to hold the Rift shut, and tasks the contestants to time travel to different episodes in the series to fix differences and catch the debuters. Death P.A.C.T. Yet Again and Team 2 lose. The timeline is further damaged along the way, causing the Rift to grow larger, culminating in Pencil's attempt to change her past accidentally resulting in Leafy being allowed onto Dream Island in "Return of the Hang Glider", causing the timeline to collapse entirely. Gaty signs One's deal to stop the collapse, and thus most of the changes to the timeline are reversed, but the Rift still remains. Upon hearing that the timeline is still imperfect, Two is horrified to notice that Gaty is missing. Meanwhile, Firey sets out with 8-Ball, who was carried by the storm onto the island that Firey was on, to search for Leafy, while Bell, Bomby, Needle and Barf Bag, trapped in One's realm, find a door which leads to the "Equation Playground".

Note: Kevin MacLeod, TomSka, Jacksfilms, Gooseworx, and Michael Gregory of Schmoyoho were also featured in this episode as voice actors.

With Two far too depressed upon Gaty's disappearance, Four and X take over as hosts while Fanny and Ice Cube begin investigating One's plans. After Pin and Ice Cube are eliminated, the challenge is a game of hide-and-seek, with both Four and X as separate seekers—the team with the most contestants found by Four and the team with the most contestants found by X respectively are up for elimination. CloudYAY loses the most to both, leaving them up for a double elimination.

Some of the contestants have been doing research about One. Bottle assumes hosting duties while Four and X are busy cleaning up their kitchen. After Yellow Face and Pillow are eliminated, she sends the contestants to the revamped Atwosment Park containing four separate challenges, each with one member from each team participating. During the contest, Donut is kidnapped by One, who offers him a deal in exchange for his arms back (which were previously stolen by Yellow Face in "Balancing P.A.C.T."). After Donut refuses, One removes his legs and kicks him out of her dimension, where he later uses Yellow Face's limbs that he finds in a bush. During the contest, Price Tag discovers that the effects of Loser's lie had gone outside the competition and that he was canceled online, and "BAGGED" and Team 2 lose. While exploring the Equation Playground, Bell, Bomby, Barf Bag and Needle come across Six, who joins them and leads them to another door leading to the EXIT, which Purple Face opens for them on the other side.

Lollipop loses her "Yellow Face Silver Standard Gold Credit Card" and suspects that someone has stolen it. Four sets up an exhibition challenge, using a device in the TV studio to send some of the former Battle for B.F.B. contestants into each other's memories to figure out who stole the card. Blocky figures out that the card was hidden in some couch cushions, though it turns out to have been taken by Match after making up with Bubble. After the challenge, Loser is overcome with guilt after learning of Winner's presence in TPOT, and ventures out to find them. In the stinger, Balloony is revealed to have been absent for at least 4 years, having been taken away by the Announcer in the UFO and going to space.

Four distributes Two's power to the remaining contestants. As the Earth goes dark, with everyone (including Bracelety, who was blown to the Waterfalls, who finds Roboty), TV (eliminated alongside Snowball) hosts Cake at Stake and initiates a battle royale as the next challenge. Purple Face leads the deal-signers and Six to the locked door to the EXIT, and Six reveals Three is also in the Fourest. One kidnaps Donut again, revealing to him that she had removed Gaty from the timeline as part of the contract, and does the same to Barf Bag and Basketball until Donut reluctantly gives up his portion of Two's power. Eventually, nearly everyone in the hotel is killed, and Pencil acquires most of Two's power from the dead contestants and TV (with Death P.A.C.T. Yet Again and "BAGGED" losing the challenge), and takes Four's power as well. One tricks Pencil into giving up Two and Four's powers by offering a chance to redo the events of BFDI. Pencil obliges and is sent back in time. One flies into space, continuing to wreak havoc. Grassy, who Pencil spared, is the last contestant alive. Winner, after being recovered by Price Tag via the WRC's wireless controller, reunites with Loser.

Set sometime before the events of the series on the Algebraliens' planet, One discovers a Yoylite meteor that grants her powers. After secretly showing the meteor to her friend Three and helping her gain their own power, One finds that Three shared the Yoylite with the other Algebraliens, and kills Three in a blind rage. After One's attempt at recovering Three leaves the latter in a disfigured and catatonic state, the other Algebraliens seal One inside the moon and leave for other planets. One later plots to exact revenge. She later finds Three in a fortress dungeon in the Fourest, and plans to indirectly use the contestants to her advantage, mostly via her contracts. It is also revealed she kidnapped Leafy during the hurricane, only to be berated by Leafy about her actions before One could show the contract. They fight, and One angrily sends Leafy away.

Back in the present, shortly after sending Pencil back in time, One pays Four back by sealing him in the moon, then abducts Nine from a planet populated by skateboards. Meanwhile, Winner and Loser make up with each other. They are joined by Firey Jr., who had respawned from Loser's discarded torch.

The black goop dripping from the sky causes several things to mutate. Although no Cake at Stake is held, Two writes down the votes cast on a whiteboard, revealing Bottle and Tree as the next to be eliminated. After Liy is recovered, Two reassigns the remaining contestants into two teams, based on a contestant's present living status at any given time, and declares that the challenge to unlock the door to their room. During the challenge, Golf Ball, Tennis Ball, Book and Marker are recovered as well. Learning what had happened to Pencil, Match rushes off to find her, joined by Bubble, Ruby and later on, X. Liy discovers she holds the key to Two's room, but has it stolen by Golf Ball and Tennis Ball; Golf Ball, while attempting to unlock the door, is killed by a stray venomous bug tendril due to Firey, 8-Ball, David, and Dora in Band Land throwing instruments on the ground, but still succeeds in doing so, rendering the alive contestants^[m] up for elimination.

As the eliminated contestants get sent to the city realm and begin to make sense of their new surroundings, they begin plotting a way to escape. Fries and Puffball attempt to smash a barrier outside, while the others, joined by Stapy and the still-competing Fanny, concentrate their attack on an exit door. As Snowball still had a portion of Two's power when he was sent away, he attempts to assist them, only to accidentally remove the door, revealing it to be a fake exit in the process. Snowball instead reverses the contestants' gravity so that everything is upright again, revealing that the location they were sent to is in fact Yoyle City, now in an even greater state of disrepair and having been transported inside Yoyle Mountain, whose peak is now separated from the rest of the mountain. After Fries, Puffball and Snowball's combined efforts destroy the barrier, the contestants fall through the hole made from the separated peak and back outside into the sky. Puffball, whose gravity is still normal, rushes to the hotel for help.

With everyone now aware of One's presence, Two declares that the challenge is to stop her once and for all. The contestants jump into action after Winner and Liy's eliminations, but are quickly separated. The ones inside the EXIT locate Three, who begins angrily pursuing them. As all of the Battle for B.F.D.I. contestants slowly begin to regroup and meet more Algebraliens, One—who is now after X—begins fighting the contestants directly. X, Two and some of the cast find Four trapped in the moon. Meanwhile, Black Hole, who is inside One's realm, searches for a way out. Balloony and the Announcer, who are carrying several Algebraliens in the latter's UFO, are soon pursued by One before flying into the Rift.

Black Hole realizes One's true motive: to restore Three to her original self and force everyone else into isolation. In the EXIT, Purple Face manages to pacify and befriend Three, who explains that Four said he would restore her, but then forgot about her. Meanwhile, Pencil tries fruitlessly to fix her past, and is eventually met by the passengers of the Announcer's UFO. Pencil then realizes that she had been set up by One and is not actually in the past, finds a new UFO for the passengers to use, and they all fly through the Rift back to the present. Pencil apologizes to Match for her actions and personally quits the competition for her own health. Just as almost all of the Battle for B.F.D.I. contestants reunite in the EXIT, One confronts them again.