There's something strange about the new kid, Sam - though Max can't quite put his finger on it. But EVERYONE else in his class is invited to Max's birthday sleepover, so his mom invites Sam too.
Sam is just as strange at the party as he is at school: he's wary of the full moon, prefers his hamburgers rare, and can't help but bite the other kids during an innocent game of Twister. But despite his initial hesitation, Max discovers that what makes us different is actually what makes us special, and that new friends can come in all shapes, sizes, and species . . .