If you can't join em, beat em

Monster Buster Club – Season 1

The MBC won't let John become an official member of the club, so he joins a mysterious, new, alien-fighting group in town called, "The Monster BEATERS Club" (who are actually evil aliens in disguise). Meanwhile, Principal Rollin forces Danny, Chris, Sam, and Cathy to join unpopular school clubs (like the knitting club and tap-dancing club).