The first Metal Master first appeared in The Incredible Hulk #6 (March 1963), and was created by Stan Lee and Steve Ditko.

[1] The character subsequently appears in Rampaging Hulk #3 (June 1977), ROM #30 (May 1982), and Maximum Security #2 (December 2000).

The second Metal Master first appeared in Avengers #676 and was created by Mark Waid, Al Ewing, Jim Zub, and Pepe Larraz.

He was banished from his planet after attempting to conquer it, and subsequently came into conflict with various heroes, including the Hulk, Rom the Space Knight, and the Scarlet Witch.

The Molyb incarnation of Metal Master appears in The Marvel Super Heroes, voiced by Paul Kligman.