"Ten Rings Hath the Mandarin!"
Soviet Yuri Brevlov faces a dilemma. He wishes to show mercy and let the Hulk escape, but this make him face treason charges back home. Before he can decide, the Hulk destroys the Soviet ship, and Brevlov only eludes the Hulk's fury by a timely rescue from S.H.I.E.L.D.'s Nick Fury. The Hulk is observed by the Mandarin, who teleports the Hulk to his castle to test his suitability as an ally. The Mandarin goads the Hulk to test his strength, but finds he cannot control the beast, and so tricks the Hulk into a quicksand pit to be rid of him. 20 pages.
Reprinted in Marvel Super-Heroes (1967) #61.