Before the Doom Patrol can answer a call to save the world from The Candlemaker in the season finale, they must first battle long-forgotten imaginary friends.

Sandi Toksvig goes roaming with Alan Davies, Sara Pascoe, Josh Widdicombe and Benjamin Zephaniah.

Ensign Tendi has her first day of work on Starfleet's U.S.S. Cerritos, where she meets fellow support crew members, Ensigns Mariner, Boimler and Rutherford. Meanwhile, Boimler is tasked with a secret special assignment and Rutherford attempts to keep his dating life intact while a sci-fi disaster strikes the ship.

Jimmy welcomes actor Matthew McConaughey plus an interview with and musical performance by Jaden Smith.