Score Creeper traps the gang in a fantasy role playing game where they must follow a complex set of rules to win their freedom.
Dr. Fox accidentally transports the gang inside her brain, where they must control her movements to complete a dangerous experiment.
A mysterious relative shows up and claims to be Unikitty and Puppycorn's uncle, but Hawkodile is suspicious.
Puppycorn is annoyed that Unikitty is always helping him and treating him like a little kid. Not wanting to be a "little brother" anymore, he eats some of Dr. Fox's "growing taffy" to literally grow bigger.
Puppycorn is determined to become the Hot Dog King and joins an underground hot dog eating contest called Wiener Club. Rick warns "you are what you eat," but Puppycorn doesn't listen and eats so many hot dogs he becomes the new champion of Wiener Club. Unfortunately he also literally turns into a hot dog, that the other club members reveal they are going to eat! Unikitty and the gang now must attack with vegetables and defeat the hot dog-eating baddies in order to save the giant hot-dog-shaped Puppycorn and turn him back to normal.
During the fireworks show, Unikitty and Master Frown were trapped in the horns on the Unikitty Castle when she caught Master Frown trying to mess up the fireworks. Unikitty tried to find out why Master Frown always grumbled.
After being rudely interrupted by Bim-Bom during her morning song, Unikitty takes advice from her friends and writes down her feelings in a letter. She intends to keep it to herself, but accidentally sends it.
Sandi Toksvig hosts the seasonal quizmas quiz, with Alan Davies, Sara Pascoe, Johnny Vegas and Josh Widdicombe.
The fast-spreading contaminant leaves Penny, Smith and friends stranded in tight quarters. Will and Maureen set out with Adler to find the Robot.
John recruits an unlikely partner to help hunt down a secret audio signal intercepted by the ship. Will begins to suspect Adler is hiding something.
Will and Penny scramble to hide the robots and figure out their next move. Meanwhile, Hastings amps up his war against the Robinsons.
Penny and Maureen become trapped in a mysterious metal trench, and Don falls prey to a nasty toxin.
While Maureen leads a mutiny, Hastings visits John to deliver an ultimatum, and Penny tries to convince Will that his Robot has changed.
While Will searches for clues to the Robot's fate, John and Judy travel to the dusty surface of the nearby planet to help their fellow survivors.
John's predicament goes from bad to worse, sending Judy on a frantic race across the planet. Penny spies on Smith -- with help from an old friend.
The Robinsons' dreams of a happy reunion fade when they realize something's very wrong aboard the Resolute. Smith seizes a chance to clear her name.
Seven months later, marooned on a watery planet, the Robinsons make a risky bid to power up their Jupiter, and Will vows to track down the Robot.
The mission to save Scarecrow takes an unexpected turn, throwing the Resolute into chaos. Judy hatches a plan to get a ship to Alpha Centauri.