Kang and Kodos

Kang and Kodos are aliens from the planet Rigel VII and appear almost exclusively in the "Treehouse of Horror" episodes of The Simpsons. Kang and Kodos are often bent on the conquest of Earth and are usually seen working on sinister plans to invade and subjugate humanity.

Goin' Green
Kang and Kodos vs The Spectre in round 1