Ben Tennyson / Glitch (voice)
Gwen Tennyson (voice)
Grandpa Ken / Max Tennyson / Azmuth Humungousaur / Omni-Kix Humungousaur / Omni-Naut Humungousaur / Shock Rock / Omni-Naut Shock Rock (voice)
Jetray / Omni-Kix Jetray / Omni-Naut Jetray / Rath / Goop (voice)
Diamondhead / Steam Smythe (voice)
Heatblast / Omni-Naut Heatblast (voice)
Phil Billings / Four Arms (voice)
Vilgax / Alien V (voice)
Kevin Levin / Quad Smack / Bashmouth / Crystalfist / Rush / Hot Shot / Dark Matter / Bootleg (voice)
Slapback / Tetrax Shard / Solar Twain (voice)
Cannonbolt (voice)
Polar Twain (voice)
XLR8 (voice)