Suggestions by @aaronpirelatinedo

Spoiler

as Our Time Shall Come in Ben 10: Imposter

Alien X

as Aliens in Ben 10: Imposter

Nanomech

as Aliens in Ben 10: Imposter

Lodestar

as Aliens in Ben 10: Imposter

Brainstorm

as Aliens in Ben 10: Imposter

Swampfire

as Aliens in Ben 10: Imposter

Rath (Ben 10)

as Aliens in Ben 10: Imposter

Diamondhead

as Aliens in Ben 10: Imposter

Wildmutt

as Aliens in Ben 10: Imposter

Stinkfly

as Aliens in Ben 10: Imposter

Upgrade

as Aliens in Ben 10: Imposter

Dave Bautista

as Tetrax Shard in Ben 10: Imposter

Mary Elizabeth Winstead

as Myaxx in Ben 10: Imposter

Xolo Maridueña

as Albeldo in Ben 10: Imposter

Ken Watanabe

as Azmuth in Ben 10: Imposter

Benicio del Toro

as Eon in Ben 10: Imposter

Meg Donnelly

as Lucy Mann in Ben 10: Imposter

Ariana Greenblatt

as Lucy Mann in Ben 10: Imposter

Isabela Merced

as Kai Green in Ben 10: Imposter

Jacob Bertrand

as Cooper Daniels in Ben 10: Imposter