Coop "Big Slammu" Bolton is the sport-oriented brother, and the strongest (as well as youngest) of the four. He was also a football player in high school. In the first episode, he uses a skateboard to get around. When he transforms into Slammu, he becomes a Whale Shark. His most prominently featured attack is called "Seismic Slam", where Slammu sets off an earthquake by hitting the ground with his fists.
- Big Slammu is voiced by D. Kevin Williams.
- Big Slammu, El Swordo, Rox, Manta Man, Moby Lick, and his brothers will guest star in the Pokémon crossover, Ash Ketchum Goes Over the Hedge. He, along with his friends and brothers, join the Ash's Adventures Team at the end of the film.
- Big Slammu not only likes to play sports, but he has a fantastic love for children. That is shown that once he became a member of the Ash's Adventures Team, he would tend to hug a few members like May and her brother Max.