Metamorpho (Beware the Batman)

Rex Mason was a security guard at Stagg Industries who was in love with Sapphire Stagg, the owner's daughter. After being trapped in a chamber and gassed with chemicals by Simon Stagg, Rex mutated into Metamorpho.

History
In "Toxic", Rex Mason wanted to marry Simon Stagg's daughter, Sapphire. On the surface Simon pretended to be happy for them but in reality he was furious and tricked Mason into getting trapped in Project Metamorpho and gassed him, mutating Rex into Metamorpho.

Beware the Batman

 * "Toxic"

Links

 * http://dc.wikia.com/wiki/Rex_Mason_(Beware_the_Batman)