Max's Monster: Grandpa Max's old Plumber partner, Phil, seeks Max's help to tame the monster within. (Introducing new Ben alien, Buzzshock; Re-introducing old Ben alien, Benvicktor.)
For a Few Brains More: Ben, Rook and Max must stop Ultimate Albedo from absorbing Azmuth's intelligence and taking over the galaxy.
Oh No I Didn't: Ceylan's self-doubt leads him to wonder what skills he brings to the team. Is he the best Tenkai Knight he can be?
(Ninnies Almost Undo Greatest Holiday This Year) When the North Pole is attacked and Santa's gift giving device (the R.E.I.N.D.E.E.R. 4000) is stolen, all clues point to the KND. Now, Numbuhs One through Five must defend themselves against an elite squad.
When the Rustbucket's a/c goes on the fritz in the middle of the desert, Ben, Max and Gwen take refuge at Holiday Village, an over the top Christmas theme park that seems to appear out of nowhere. It turns out the place is run by an evil entity.
Eddy's Christmas is in jeopardy. All of his presents stink! Edd and Ed try to tell Eddy that Christmas is about more than just 'gettin' stuff', but Eddy refuses to believe it. He hatches a plan to get adopted into somebody else's family.
View to a Skrill - Part II, A: Tuffnut goes undercover to help the gang rescue a Skrill captured by the Beserkers.
Holy Matrimony!: James is revealed to own a Growlithe.
View to a Skrill - Part I, A: Bucket and Mulch accidentally discover a Skrill, and its up to the gang to save it from the Beserkers.
The only thing worse for Nigel than being sick on the first snow-day of the year is when the evil Fourth Grade President attempts to capture and return every kid to school for a special assembly!
Ed becomes convinced that Santa Claus is watching his every move, so he avoids doing anything that could be interpreted as naughty. Meanwhile, Edd refuses to stand under Ed's mistletoe. Cry Ed: Eddy is desperate for attention.
Johnny borrows a new invention from the girls that lets him talk to animals. But he accidentally encouraged all the Chipmunks in Porkbelly to take over the world!
Muscle Man, Rigby, Mordecai and High Fives want to get a stuntman license for Timmy's birthday party.
The park guys need to get Thanksgiving dinner for their families to save Thanksgiving.