Frankie and Draculaura go on the haunt for proof that aliens have invaded Monster High.
Draculaura and Frankie watch a movie together about an alien invasion. It disturbs them deeply; so much so that they are convinced aliens have come to take over Monster High. Specifically, their suspision is raised when they find Frankie's locker covered in unspecifiable green slime. They share their concern with Cleo and Deuce, but all they do is laugh. Their disbelief fuels Frankie's and Draculaura's conviction in an alien invasion, because in the movie no one believed the protagonists either. They decide to hunt for evidence, which Spectra reports on in The Ghostly Gossip.
The duo runs into Slo Mo at the front doors. He has a small object wedged into the skin of his hand, which Frankie identifies as an alien implant. Headmistress Bloodgood takes a look as well and pulls the object out with a pair of tweezers. She establishes that it is nothing more threatening than a splinter and concludes that there are no evil aliens at play. Frankie and Draculaura immediately suspect her of either being an alien or under alien control, which is such a ridiculous claim that they are on the verge of alienating even their friends.
The two consider ending their search for evidence when they spot a track of the same green slime that was in Frankie's locker. They follow the trail to the gym and find what looks to be an alien. Draculaura texts several friends to check it out. When they arrive, so does Mr. Hackington who reveals that the "alien" is just a contaminated lab rat that escaped from its cage. As their friends laugh once more, Frankie and Draculaura accept that they were wrong about the alien invasion. Headmistress Bloodgood meets them at the front doors and requests that they won't spread any more rumors. They agree to comply, but as they walk away, "Headmistress Bloodgood" short-circuits. The alien controlling the robotic copy of the headmistress doesn't mind, as they've already succeeded in their goal of keeping their presence a secret.