Yellowjacket

Yellowjacket is an Iconic Supervillain appearing in Marvel Online Universe. Doctor Darren Cross was a self made millionaire, he created and headed his company, Cross Technological Enterprises, and made it a success to rival the 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 and enhanced Cross's circulatory system. This attracted the attention of Scott Lang looking to save his own daughter's life. The resulting battle with Ant-Man burned out Cross's heart, apparently killing him. Darren's body was secretly kept in a cryonic state, and he was brought back to life with a burning hatred for Lang. He eventually stole an a high-tech mass suit from Pym Technologies giving with superhuman abilities including Size-shifting and alteration superhuman strength, agility, reflexes, senses, and healing, along with bio-energy projection.

A skilled tactician, scientist, and former businessman, Cross is the rival and sworn archenemy of Scott Lang, the second Ant-Man, and has become obsessed with gaining revenge against him by destroying his life everything he loves, and will stop at nothing to achieve his goals.