The Juggernaut has appeared in several Tuckermeows adventures. He was equiped with a chain-gun whenever he showed up and was very powerful. Currently, he is the most powerfull creature who has an actual weapon in the game.
The Juggernaut's first appearance was in a part of Sovester's Iraqi Adventure! When most soldiers failed to kill Cotton, the Juggernaut's were sent down (they were also killed by Cotton, though)
The Juggernaut has also appeared in Tuckerzombies as a hidden ally. In Deep S**t, the Juggernaut is the second most powerful item you can find in the Mystery box (the first being a re-creation of nintendo's Mario, who had a maximum damage bonus)