During the 1970s, Doom branched out to more Marvel titles, with a battle between Victor von Doom and Prince Rudolfo over control of the Latverian throne being featured in Astonishing Tales. Doctor Doom also attempts to use the Hulk as his slave during two issues of The Incredible Hulk. The character also made several appearances in the story arcs of Super-Villain Team-Up, starting in 1975, as well as appearances in Marvel Team-Up, beginning with issue #42 (February 1976). In August 1981, Doom also made an appearance in Iron Man when the two traveled to Camelot, where Stark thwarted Doom's attempt to solicit the aid of Morgan le Fay into defeating King Arthur 's forces with an army of revived warriors who were slain by the sword Excalibur; Doom swore deadly vengeance for that interference, which stranded him in the past - this vengeance had to be indefinitely delayed in the interest of returning to the present day.