A little kid named Kenny takes Chimpy to Professor XXXL's lab. While the Professor suspects Kenny will knock open the mysterious disease containers, it is actually Chimpy who causes the havoc.
Two men try to carjack the Rustbucket while Grandpa Max is out. Fortunately, Ben is on the Rustbucket and the carjackers end up messing with Fourarms.
Ben and Gwen want something from the vending machine. When Ben's snack doesn't come out of it, his plan to retrieve it as Grey Matter backfires.
A little girl's kitty got stuck. Ben wants to go XLR8, but he ends up as Stinkfly.
Ben and Gwen are tired of the music Grandpa Max listens to. Ben mixes it up as Upgrade - in more than just the figurative sense.
Series Finale: When Ben unwittingly puts out the campfire needed to roast marshmallows, Ben must start the fire again without using the Omnitrix. But when Max isn't around, Ben ends up using Heatblast and later pays the price. (The Season Had to be Shortened Because They were no more shorts to be completed.)