1You Know Those Buttons Don't Do Anything, Right?
Several months after the events of BFB 16, Two allows a new contestant on the show. We catch up on the old contestants as they try to complete the first challenge, which is to get to the top of a building.
2The Worst Day of Black Hole's Life
Taking place as the second challenge, the teams must build a stack of block and not be the shortest one to not get their team up for elimination.
3Getting Puffball To Think About Rollercoasters
The remaining contestants visit Two's amusement park, which has been seen no visitors at all. The teams must help Two, by building attractions in order to garner the park attention. However, a new twist in the eliminations occur in the end.
4Gardening Zero
Two has the teams travelling to different biomes, in order to keep their designated funny plant alive for as long as possible, as it's now on the brink of extinction.
5Fishes and Dishes
When Two's favorite plates are accidentally sent tumbling straight into the Goiky Canal, they send the teams on an underwater adventure to retrieve them.
6The Great Goikian Bake-Off
Right before Cake at Stake, it is revealed Four and X have returned after BFB ended and are making food in the hotel. Two decides the teams will have to make them food for the challenge, and they will rate how much they like them.
7The Seven Wonders of Goiky
Lightning, being angry at his team, ends up destroying 7 landmarks in Goiky. Two turns this into the challenge and sends a different team out to fix each one. Meanwhile, the eliminated BFB contestants continue their journey to escape Four.
8Balancing P.A.C.T.
The challenge is to not fall off of a balance beam, the first two teams to lose all their members are up for elimination.
9Outbreak At Stake
Once Barf Bag is filled with lava-infused barf, the effects of it starts a zombie outbreak. Two makes the contest to stay alive. Four, X and Clock temporarily leave the hotel for a trip, while all of the EXITors split up to try to escape.
10Oneirophobe's Nightmare
Two sends the contestants into their teammates' subconscious to turn their nightmares into dreams. Meanwhile, Barf Bag is in hiding.
11Out Of The Blue
The exitors split up into three groups and explore the EXIT, attempting to find a way to escape.
12What's Up Bell's String?
A team swap is initiated, and the contestants have to fill up their team's pit as much as possible as the contest. One stops hiding in the background and gives some disabled contestants a favour.
13Category One
When One hijacks the EXITor debut and summons a storm to hit Goiky, Two tasks the teams with defending the hotel from the storm. However, the storm is plagued by some unwanted adversaries from past episodes.
14I Said Careful!!!
Two challenges the teams to get a flag from the top of the summit of one of two mountains, either a snowy mountain or a volcano. However, a monstrous plant and avalanches stand in the way.
15Seasonal Shift
The failed debuters altered the timeline using the Yoylite used by Tennis Ball ten years prior, and the teams are challenged to bring them back to the present and fix the timeline to return it back to normal.
16The Power of Four
As Two is still sad about Gaty's disappearance, Four and X fill in for them as hosts. They then challenge the teams to a hide and seek game.
17Bottle for Dream Island
Bottle takes over as host and challenges the teams to gain points from the reopened Two's amusement park attractions.
18BFB 31
Someone stole Lollipop's credit card and Four challenges the post-splitter contestants to find it.
19Last One Standing
Four and Two become aware of One's presence, but the situation becomes devastatingly unmanageable when one of the eliminated contestants announces a Battle Royale challenge.
20Alone
16 years before the events of "Last One Standing" One finds a strange meteor at the Equation Playground.
21Insectophobe's Nightmare 6
The aftermath of One's takeover finds our contestants in another Insectophobe's Nightmare. And with two eliminations looming, tensions are running high as we enter our next challenge.
22Suite Escape
After being trapped in an upside down city, the eliminated contestants try with all their might to break the barrier.
23Homeward Bound!
Part 1 of the "Defeat One" trilogy. Current and eliminated contestants split up to find a way to defeat One - and to find each other.
24That's What Foes Are For
Part 2 of the "Defeat One" trilogy. It's time for Black Hole and One to have a chat. And is Pencil really in the past? What's she doing over there, huh?
25All for One
Part 3 of the "Defeat One" trilogy. It is time to take down One once and for all.