Conversation so far:
What film did John Henry Irons appear in?
An alternate universe version of John Henry Irons appears in Justice League: Gods and Monsters.
Which characters were in the film Justice League: Gods and Monsters with Steel?
Will Magnus, Michael Holt, Karen Beecher, Pat Dugan, Kimiyo Hoshi, Emil Hamilton, Thomas Morrow, and Stephen Shin are all characters from the film Justice League: Gods and Monsters.

Question: Who is Steel's main enemy?
Self-contained rewrite: Who is Steel's main enemy in the D.C. Comics?