Monster Beaters is the 11th (sometimes 13th) episode of Monster Buster Club.
John tries to convince The MBC Members, including his older brother, Chris, to allow him to join, but they reject him because he is too young. However, a new monster fighters club called "Monster Beaters" appears in Single Town and John is welcome to join them. Meanwhile, the school opens several new after school classes or clubs and everyone must join one of them; Sam and Danny get into knitting club; Cathy is assigned to science club; Chris forced to visit a tap dancing club. The MBC Members soon get to the truth about the Monster Beaters – they're aliens. John, however, doesn't believe Chris and continues to work with Monsters Beaters. Will The MBC Members be able to save John from the aliens before it's too late?
- The Electrobubble is used multiple times in this episode.