Jason Quantrell (Earth-616)
But Jason...Jason was a smart cookie. Too smart. See, Jason opened a door...and we reached in. He still screams occasionally, but he's not coming back. We're in charge now. Hostile takeover. Cortex Incorporated has been eaten from the inside. Cortex...is a husk. A shell. A mask. Welcome to the Beyond Corporation.
Jason Quantrell was the CEO of Cortex Inc., a company involved in illegal activities,[2] including working with Gideon Mace.[3]

Jason's body being used by a "debaser unit" Beyonder as its avatar
At some point, while experimenting with alternate dimensions, Quantrell opened a portal to outside the Multiverse, which allowed a "debaser unit" Beyonder of the Beyond Corporation to enter his universe. As he looked into the Beyond, the entity reached in and turned him into its avatar,[4] subsequently taking up his plans to take over the world using products and brands which infected the public consciousness in order to slowly control society.[5] Its plans, however, were ultimately foiled by the Mighty Avengers and the Beyonder ended up removed from reality alongside Quantrell.[1]