Ben 10 Vol 4 - Grudge Match

Max’s past as a former Plumber — a secret organization that protects the Earth from evil aliens —
emerges as an ex-Plumber tries to steal the Null Void Projector and imprison Ben, Gwen and Max in another dimension (Truth). 

Ben discovers the powers of a new alien, Cannonbolt, and is able to destroy a giant planet-draining alien (Big Tick). Kevin 11 is back for revenge and he is committing crimes in the form of Ben’s aliens (Framed). But Ben must soon learn how to work WITH his enemy Kevin if they are both to survive an alien gladiator battle (Grudge Match). Finally, what’s this? Gwen with the Omnitrix and its powers? Can Ben learn to be a team player and NOT be hero?!