Cast of Ben 10: Alien Force

Yuri Lowenthal provided the voice for Ben Tennyson, the main protagonist of Ben 10: Alien Force. Ben Tennyson is a teenager who is able to transform into various powerful aliens with the help of his Omnitrix, a watch-like device with the power to alter Ben's DNA.

Greg Cipes voiced Kevin Levin, one of the main characters in Ben 10: Alien Force. Kevin is a former antagonist turned ally who has the ability to absorb the properties of any material he touches.

Dee Bradley Baker lent his voice to the character of Swampfire in Ben 10: Alien Force. Swampfire is one of the alien forms that Ben Tennyson can transform into, possessing plant-based powers such as the ability to generate fire and regenerate his body.

Ashley Johnson portrayed Gwen Tennyson, one of the main characters and Ben's cousin in Ben 10: Alien Force. Gwen possesses magical abilities and is highly skilled in using her powers to protect herself and others.

Tim Curry voiced Dr. Joseph Chadwick/Forever Knight #2 in Ben 10: Alien Force. Dr. Chadwick is a scientist turned villain who belongs to a secret organization known as the Forever Knights.

Paul Eiding provided the voice for Max Tennyson, Ben's grandfather in Ben 10: Alien Force. Max is a retired Plumber (an intergalactic police force) and serves as a mentor to Ben and his team.

Vicki Lewis voiced Serena in Ben 10: Alien Force. Serena is a member of the alien species known as the Nasca, who has the ability to generate seismic energy.

Kevin Conroy provided the voice for Bellicus/Warrior #2 in Ben 10: Alien Force. Bellicus is an alien being who shares a consciousness with Serena and aids in the control of her powers.