Michael Morningstar/Earth-69

Darkstar is a main villain in the first and second seasons of Ben 10: Alien Universe, as well as the sequel series Back in Action: Alien Universe.

Appearance
In Ben 10: Alien Universe, Darkstar looks very similar to his appearance in Ben 10: Alien Force, minus the cape and eye holes in his helmet. When he appeared in Ben 10: Invasion of the Omnitrix, he appeared yellow because this was a copy of himself inserted in the Omnitrix to steal DNA. He fleed at the site of XLR8 for unknown reasons. When he appears again in Darkstar Falling, the four DNA samples he had stolen (Humongousaur, Brainstorm, Alien X, Chromastone), were restored to the Omnitrix, and he was defeated by Cannonbolt.

In Back in Action: Alien Universe, he will look more like Eon, with a visor on his helmet. He still lacks his cape, nonetheless, but is now taller and more muscular.

Personality
Darkstar, following the events of his appearances in Alien Force, seeks Ben's alien powers so that he may be stronger. After losing the ability to simply suck the life energy from girls at his school, as well as his looks, Ben and Gwen's powers are his only true source of unlimited power.

He has a crush on Gwen, but doesn't see Cooper or Kevin as threats to his goal of dating her.