Conversation so far:
what special powers did Kevin Sydney have?
Kevin Sydney is a mutant metamorph with the ability to alter his physical appearance and voice at will to resemble that of any person he chooses.
What did Kevin Sydney do with his powers?
He acted as the Mutant Master's second-in-command in an effort to trigger World War III

Question: Did he fight anyone using powers
Self-contained rewrite: Did Kevin fight anyone using his powers?