Leonard Williams was a professor at Cambridge University who worked with a young Bruce Banner to recreate the Super-Soldier Serum, becoming a mentor to him.

Williams disappears in an unexplained occurrence in which several people are killed, and comes to be considered a missing person.

[2] Unbeknownst to the public, Williams survived, became the first Hulk, and assumed the identity of Tyrone Cash, killing numerous people throughout Africa and Asia before becoming a gangster in South America.

Blade defeats and depowers him before bringing him to the Helicarrier, where Nick Fury kills him.

An alternate universe variant of Tyrone Cash from Earth-15513 appears in Secret Wars as a member of the Thor Corps on Battleworld.