MARVEL TEAM-UP (1972) #21

Stunned by a spell from Xandu, Spider-Man steals the Crystal of Kadavarus in order to bring back the evil mage’s love from a coma. Guest-starring Doctor Strange! While web swinging around the city one night, Spider man comes across a group of four muggers assaulting an elderly, white-haired gentleman. Spider man runs the attackers off, but the victim, instead of thanking Spider man, puts him into a trance. Revealing himself to be the magician Xandu, the man conjures up an image of the Crystal of Kadavus, a skull-shaped gem hidden in the Sanctum Sanctum of Dr. Strange.…