Based on the original animated series Ben 10. Ben becomes targeted by an evil Mechamorph Warrior, named "Retaliator," who mistakenly blames Ben for something he did not do and attempts to destroy all aliens.
| Actor | Role |
|---|---|
 Tara StrongBen Tennyson / Upgrade / Sandra Tennyson / Computer (voice) | Ben Tennyson / Upgrade / Sandra Tennyson / Computer (voice) |
 Meagan MooreGwen Tennyson / Girl Student (voice) | Gwen Tennyson / Girl Student (voice) |
 Paul EidingGrandpa Max (voice) | Grandpa Max (voice) |
 Dee Bradley BakerStinkfly / Vulpimancers / Carl Tennyson / Cash Murray (voice) | Stinkfly / Vulpimancers / Carl Tennyson / Cash Murray (voice) |
 Steve BlumHeatblast / Mechamorph | Heatblast / Mechamorph |
 Jim WardDiamondhead | Diamondhead |
 Richard McGonagleFour Arms / Ben’s Teacher (voice) | Four Arms / Ben’s Teacher (voice) |
 Fred TatascioreWay Big / Evil Way Big (voice) | Way Big / Evil Way Big (voice) |
 Richard Steven HorvitzGrey Matter / Dispatcher (voice) | Grey Matter / Dispatcher (voice) |
 Dave FennoyTetrax (voice) | Tetrax (voice) |
 Dwight SchultzDr. Animo (voice) | Dr. Animo (voice) |
 Adam WylieJT (voice) | JT (voice) |
 Robert David HallAzmuth (voice) | Azmuth (voice) |
 Troy BakerRetaliator / Boy Student (voice) | Retaliator / Boy Student (voice) |