Prisoner Number 775 is Missing

Prisoner Number 775 is Missing is the twenty-first Ultimate Alien chapter of Clock 10: Choose Your Own Adventure.
==Plot==
During a relaxing camping trip, Clock's team is interrupted when Cooper calls the Ultimatrix, informing them of needing their assistance at what remains of Area 51. Upon finishing their snacks, Clock uses a portal spell (which is newly reunlocked by Charmcaster) to send them to the base.
Upon arriving, the group finds Area 51 indeed gone, with a crater in its place. In the crater is what Colonel Rozum later explains to be a prison. He tells what the one survivor (who is no longer surviving) recollects: Psyphon came to the base in search of a piece of technology, but wiped out the entire compound upon realizing the tech was not present.
Rozum's assertion is to not go after Psyphon yet, but to have the Plumbers help with the rebuilding of the facility, while Clock does a body count. Cooper helps by remarking the prison's tech does not protect against intangibility. Clock opts for Big Chill, phasing into the prison to do his sweep, counting 774 prisoners before exiting and becoming human. Rozum becomes worried, as the prisoner count should be 775.
As they talk, an unauthorized take off of a Plumber ship begins. Clock attempts to go Big Chill again, but ends up with Rath. Due to an offensive comment, Charmcaster uses a spell to throw Rath to the ship, causing him to get partially stuck in it. Rath burrows his way into the now plummeting ship, but finds no one inside. He attempts to keep the ship in the air, but is foiled due to his natural anger and stupidity, and ends up crashing the ship faster.
His team then catches up with him upon his transformation back to human, and he explains the situation. Taryn and Charmcaster track the prisoner to the city, and it isn't long until they find him: Prisoner 775 approaching innocent civilians. Clock activates the Ultimatrix, turning into Sandbox. He attempts to fight 775, though the latter dodges each attack before running off. Sandbox follows, able to track him into a nearby buliding from the sand left behind by 775's attack on him.
Entering the building, they are ambushed by 775, who fails to attack Sandbox, and is instead trapped in one of Taryn's force fields. He identifies himself as a Merlinisapien from the planet Abscondas, which no one knows about as it is hidden. He continues to elaborate that knowing the name is of no concern, as again the planet is hidden, but also it is a "lost cause." It was ravaged by war between the Merlinisapiens and a snake-like species which 775 refuses to state the name of, and that he was trapped on Earth by Rozum when trying to get help.
The group decides to try to help 775 return to Abscondas, but due to Kevin's wording, 775 interprets it differently, and disappears. This proves to successfully trick Taryn, as she lets down the force field only for the building to collapse due to 775 escaping, which they are protected from by Charmcaster's force field. Kevin then determines that 775 twisted his words to try to go after Rozum's family in retaliation for what happened to his own.
Clock opens a portal to Rozum's family to get to them, which results in 775 utilizing the same portal to make his task easier. 775 hurries off, becoming invisible as he leaves. Clock becomes Blitzwulf, using his enhanced smelling to track 775 to Rozum's family home at Cape Canaveral. The group attacks him, attempting to keep him from killing Rozum's family.
It isn't long before Rozum arrives, only for him to be ambushed by Prisoner 775. 775 extends a stinger from his tail, threatening that Rozum will only be able to lie in wait as he watches his family die. Being taunted by 775, Blitzwulf changes into Snakepit, whose appearance alone is enough to make 775 hesitate out of PTSD. 775 injects his stinger into Rozum, paralyzing him, before running away. Snakepit has Taryn and Kevin stay with Rozum and his family, while he and Charmcaster go looking for 775. The two find 775 cowering in the corner of an alleyway on the base, begging to "be with his family." Snakepit refuses, opting to take him into custody instead.
The Plumbers arrive an hour later to take away 775, but not before the Ultimatrix scans his DNA. Clock laments on the idea of Bellicus not being open to reviving Abscondas, but then tries out the new transformation, ChamAlien. The episode ends with Charmcaster portaling the group back to the campsite, annoyed by ChamAlien's singing of Captain Jack Sparrow by The Lonely Island.
==Major Events==
*This marks the first episode where Charmcaster is a full time team member.
*The Ultimatrix scans Prisoner 775, unlocking ChamAlien, who then proceeds to debut.
*Sandbox and Snakepit debut.
===Ultimatrix Debuts===
*Sandbox
*Snakepit
*ChamAlien
==Characters==
*Clockwork Firefly
*Taryn Firefly
*Kevin Levin
*Charmcaster
*Cooper Daniels
*Helen Wheels
*Pierce Wheels
*Manny Armstrong
*Alan Albright
*Magister Patelliday
*Colonel Rozum
**Rozum Family
===Villains===
*Prisoner 775
==Aliens Used==
*Big Chill
*Rath (selected alien was Big Chill)
*Sandbox (debut)
*Blitzwulf
*Snakepit (debut)
*ChamAlien (debut)
==Trivia==
*The dialogue for the episode does a variation of the Overkill joke from the beginning of the canon episode.
**This also includes the joke of calling ChamAlien "Overkill" at first.
*Rath was intentionally used within the same moment as he was in the canon version of the episode.
*The snake-like species mentioned by Prisoner 775 are the Anguisapiens, whose lore is specifically original to Earth-1799 before being added to CYOA's lore.