Marvel Super-Heroes #20 (7.0)

Title: Marvel Super-Heroes 
Issue: #20
Publisher: Marvel
Year: 05/1969
Grade: FN/VF 7.0

Origin of Victor Von Doom and first appearance of Valeria (love interest of Doom and namesake of Reed & Sue Richards daughter)

Diablo holds Valeria hostage and tries to force Dr. Doom into becoming his partner.