Ben 10 - Season 2 - Eps 12: Dr. Animo and the Mutant Ray
The Tennysons arrive at a swamp, where a festivities of Gatorfest start first thing the next day. Gwen finds Ben playing around with the Omnitrix, and she warns him that it may create unusual problems. Without heeding Max and Gwen's warning, he pops the face out, and the Omnitrix acts up. Right away, something was wrong, though it was gone unnoticed, at least, until the next day. Gator-fest was going along well, but the giant frog of Dr. Animo comes in to disrupt it. Dr. Animo has returned, and he wants to take revenge on Ben. But when Ben goes alien, he transforms into a hybrid alien with unbalanced attributes. Will Ben ever learn his lesson in listening for a change?
About Ben 10

Title: Ben 10
First Air Date: 2005-12-27
Last Air Date: 2008-04-15
Status: Ended
Rating: 8.152/10 (from 1655 votes)
Language: EN
Seasons: 5
Total Episodes: 52
Network: Cartoon Network
Genres: Animation, Sci-Fi & Fantasy, Action & Adventure, Comedy, Kids
Production Companies: Cartoon Network Studios, Man of Action Entertainment
Synopsis
When 10-year-old Ben Tennyson discovers a mysterious device, he gains the power to change into ten different alien heroes, each with uniquely awesome powers. With such abilities at his disposal, Ben realizes a greater responsibility to help others and stop evildoers, but that doesn't mean he's above a little superpowered mischief now and then.
Cast

Tara Strong
Ben Tennyson (voice)

Meagan Moore
Gwen Tennyson (voice)

Paul Eiding
Grandpa Max (voice)