Sir Meows A Lot is put on trial by the Cucumber Aliens and forced to prove he is not evil. He is about to fail, when Denis arrives just in time to save his best friend.
The alien cucumbers arrest Sir Meows A Lot for future crimes against the galaxy and take him away. Denis tries to rally help from his neighbors.
Sir Meows a Lot has been pranking the neighbourhood cats again, Denis sends him inside for a time in. Sir Meows A Lot tries to evade his captor and go back outside, but Denis foils his plans.
Sir Meows A Lot is determined to stay awake and see the ball drop on New Years Eve, but has to resort to time travel when his enjoyment keeps getting interrupted.
Needing more candy than Denis brought home, Sir Meows A Lot reluctantly agrees to trick or treat for the first time. But when his trick or treating doesn't pull in as much candy as he had hoped, he decides to do things his own way.
Sir Meows a Lot stumbles upon a pamphlet for kitten adoption and convinces himself that he's about to be replaced by a younger, cuter cat. He seeks out cute eyes training at the remote Cat Mountain.
The Clone accidentally saves an old lady and becomes a media sensation. Seeing him on the news, Sir Meows A Lot panics and moves fast to retrieve the clone from the spotlight before Denis finds out he has a clone.
Pinchy takes a summer vacation in Sir Meows A Lot's sandbox, infuriating Sir Meows A Lot, who then goes to extreme lengths to get rid of the unwanted house pest, only to make him feel right at home.
A skunk crash lands on Denis' doorstep with a crazy tale to tell about how he was kidnapped by aliens, then rocketed to earth, then was reborn as a robot, all just to warn Sir Meows a Lot of an impending Cucumber invasion.
Lady Barks a Bit's Denis obsession becomes a problem when she steals all his stuff and then tries to hide it on Valentine's Day. Sir Meows a Lot tries to expose her, so he won't take the fall for the missing items.
Weird things are happening around the house. Suspecting ghosts, Denis and Sir Meows A Lot go full ghost busters until Sir Meows realizes it's actually aliens - and gets the house fumigated, telling Denis it's termites.
Sir Meows A Lot needs a machine part from the store but Denis is too sick to get out of bed, so he puts Denis into a plastic bubble and pushes him to the store, only to forget about him when he gets what he needed.
Denis wants to go camping to practice his survival skills, tells Sir Meows A Lot to take a pill so that he doesn't get ticks or fleas. Sir Meows doesn't take it, then right away gets fleas and goes to great lengths to get rid of them.
When Sir Meows a Lot complains about Denis never being home, Denis encourages his pal to try to make other friends by finding someone he has things in common with. Sir Meows a Lot eventually does find his perfect match.
Denis finally finds Sir Meows A Lot, but he has no recollection of Denis or their life together.
Sir Meows A Lot gets pulled into the darkness of the Christmas Tree, where cats forget who they are and stay lost forever. Denis goes into the tree to find Sir Meows A Lot, but only finds Pinchy, who offers to act as a guide.
Sir Meows A Lot chases aliens up a tree, then gets stranded at the top. Denis tries to enlist the neighbours to help get him down but nothing works. Denis refuses to abandon him and in an act of solidarity offers to become tree folk.
Denis thinks he and Sir Meows A Lot have too much stuff and suggests they have a garage sale. While Denis struggles to make any sales, Sir Meows A Lot easily sells off destructive technology that throws the neighborhood into chaos.
Denis goes next door to play with Lady Barks a Bit. Sir Meows A Lot gets insane with jealousy and tries to outplay Lady Barks A Bit but the constant demands from both cause Denis to crash.
Sir Meows A Lot won't stop scratching the couch so Denis sprays it with Slip Away to keep his pal away but only turns the house into a slip-and-slide. Meanwhile Sir Meows A Lot figures out the ultimate way to satisfy his urge to scratch.
