After finding out her grandmother won't be visiting for Christmas, Lucy decides to cheer herself up by throwing the ultimate New Year's Eve party. Meanwhile, Charlie Brown tries to fulfill one of his resolutions before the clock strikes midnight.

It’s Christmas time in Swallow Falls and to Sam’s surprise there’s not a single Santa Claus decoration! Until Flint introduces her to their version of Santa, Lobster Claus! Frustrated, Sam writes to Santa to tell him about Lobster Claus taking credit for all of Santa’s work. Santa unexpectedly arrives in Swallow Falls to challenge Lobster Claus. The town blames Sam for ruining Christmas, and she and Flint must find a way to make peace between the two Clauses.

There is some monstrous Halloween fun brewing in Swallow Falls! Flint accidentally creates his own Frankenstein- like monster. The Monster quickly becomes attached to Flint, and Flint has to learn to live with his new "son". Things get even more frightful when Mayor Shelbourne buys up ALL the town's candy at Halloween, and promises to give it to any kid who can make it through his super-scary haunted house. Is Candy-obsessed Sam up to the challenge?

The citizens of GASI headquarters start disappearing from a bright blue flash and the monkeys plus YAY-OK must save them. They have also turned into princess monsters created by an evil princess named Princess Monstare. Eventually YAY-OK tries to fight her, but she turns into a robot with him and the monkeys must save him and stop her.