When Mr. G unearths a mysterious crystal skull from his garden and brings it to school, he inadvertently summons an ancient Mayan Sky Queen who takes over his classroom. She entrances all the males in the school to help her prepare for a ritual that will unite her with the Sun King and end the world. At first jealous, Sarah and Erica soon realize it's up to them to save the school – and the planet – from the Queen's apocryphal plans. They ask themselves what Ethan and Benny would do and, with Grandma's help, make a plan to block the sun, channel the moon, and save the day.

When the town's water pressure mysteriously drops and two teens go missing – one from a pool and another from a school washroom – the gang begins to suspect something fishy's going on in Whitechapel…or is it something alligator-y? Rory confesses to flushing two baby alligators during last year's locker search at the same time that Benny flushed one of his magic potions. When Erica is attacked at the school car wash, they realize they're now battling two very angry alligators AND their evil mutant mega spawn. And the citizens of Whitechaple are about to be the gators' next meal!

During the annual cookie drive for Jane's youth troop, a creepy, otherworldly Troop Leader conspires to rid the town of all adults, and lure the kids to its Eternal Playground. With all the grownups gone, Ethan and the gang have to take charge and stop the beast before Jane is lost forever, and the vampires – especially Sarah and Erica – get hungry enough to start preying on the young...