Creation
Doctor X was created in the Action Man collection released in 1993.
IDW Comics
After the death of Doctor X, Mercy Gale adopted the codename Doctor X.
Other Media
- In the Action Man animated series, released in 1995, Doctor X leads the organization The Council of Doom, a rival organization to Action Force. according to the bible series, Action Man was in true Matthew Exler and Doctor X was his foster brother Dorian Exler,