Read more about Darren Cross at: Wikipedia

Official Site: Marvel

Darren Agonistes Cross is a fictional supervillain appearing in American comic book published by Marvel Comics. He is the archenemy of Scott Lang (the second superhero to be called Ant-Man), and the cousin of Crossfire.

The character was portrayed in live-action by Corey Stoll in Marvel Studios' 2015 film Ant-Man as the Marvel Cinematic Universe's iteration of Yellowjacket. This concept would later be integrated into the comics, making Cross the third version of Yellowjacket in the Marvel Universe.

Created by John Byrne and David Michelinie, Darren Cross debuted in Marvel Premiere #47 (April 1979). The character made his first appearance as Yellowjacket in The Astonishing Ant-Man #12 (September 2016), which was written by Nick Spencer and illustrated by Brent Shoonover.

Darren Cross is a millionaire and the founder of a successful corporation, which rivals its top competitors. Cross was diagnosed with a heart condition due to overwork, and had to use an experimental nucleorganic pacemaker in order to save his life. The pacemaker was a success but enhanced Cross's circulatory system, mutating his body and giving him superhuman abilities. With a side effect that overuse causes the burning out of his heart, Cross went through various heart transplants, which led him to capture surgeon Dr. Erica Sondheim to replace his heart and to abduct "donors" from the slums. This attracted the attention of the second Ant-Man looking for Sondheim in order to save his own daughter's life. The resulting battle with Ant-Man burned out Cross's heart, as Sondheim had reimplanted his old, worn-out heart prior to Ant-Man crashing the surgery.

Darren Cross has not been a contender in any CBUB matches.