"Encounter at Land's End!", reprints
March 1975
Namor rescues Doom, and the two consider a partnership
reprints
*
Sub-Mariner #20
"In the Darkness Dwells Doom!"
December 1969
(12/1969)
Doom captures Namor, and suggests they join forces
*
Marvel Super-Heroes #20
"This Man... This Demon!"
May 1969
(5/1969)
Diablo uses Valeria to convince Doom to join forces with him
reprinted in
*
Essential Super-Villain Team-Up TPB #1
2004, in collection
(2004*)
*
Marvel Digital Comics
no date
(no date)