Doctor Strange #172 (September 1968)
Cover Art by Gene Colan
Dormammu, having survived his battle with Eternity, is living in the Nameless Realm where he now rules. Taking Clea captive, he lures Dr. Strange into the realm where he traps him too. Dr. Strange manages to free himself and Clea with the help of Victoria Bentley and returns them to Earth. Then goes back to face Dormammu and his demon army.