Sigma

"Gha ha ha ha ha...! Isn't it painful to have to watch while others suffer? You can put up with your own pain......but can't bear to see others, especially Zero, harmed, can you? I'm taking Zero, the one most important to you... to the underworld! Goodbye, X... Gha ha ha ha!"

- Sigma

Sigma is the main antagonist of the Mega Man X series. He will appear in the 101st episode of Death Battle, Ultron VS Sigma, where he will face Ultron from Marvel Comics.

Trivia

 * Sigma is the fourth Mega Man character in Death Battle, after Dr. Wily, Mega Man and Zero.
 * Sigma is the ninth non-DC character to fight against a Marvel character, after Lord Raiden, Goliath, Darth Vader, Raiden, Pinkie Pie, Android 18, The Shredder and Lucy.