Brief History

A scientist whose chemicals accidentally mutated his son. This made his son become a mutant naming himself the Mimic. He was able to mimic other mutants' powers. Ronald had built a machine to de-power Calvin again, but in the long-term, it obviously failed.  He died not soon after Calvin was first mutated.
 
 

Other Versions

Another version of Mimic appears in the Exiles for one issue.