Doctor Strange and Doctor Doom: Triumph and Torment
"Arguably one of the most overlooked gems in Marvel's immense library, this story by Roger Stern, Mike Mignola and Mark Badger  pits Dr. Strange in the unlikely role of savior as he's tasked by the Vishanti to assist Dr. Doom in rescuing Doom's mother from Mephisto. As you can guess, Dr. Doom takes over the book to some extent, but Dr. Strange carves out a place for himself like a surgeon as an ally and adversary to Doom." --Chris Arrant, ifanboy.com"In this graphic novel written by Roger Stern with art by a young Mike Mignola, Doctor Strange is forced to help Doctor Doom try to save the soul of Doom's mother, who has been doomed to hell. During their battle against Mephisto in hell, there are a number of twists and turns, all beautifully illustrated by Mignola and Mark Badger. While he had won the title of Sorcerer Supreme over Doom (Doom's second-place finish is what put him into a position of requesting Strange's help), it was this story that proved that Strange truly had earned the title." -- Brian Cronin, comicbookresources.com