Namor, the Sub-Mariner (1966)
"Dr Doom's Day"

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At the Hero Peace Building, the X-Men, Thor, and all of the other heroes are gathered, but they are attacked by numerous forces of evil including the Mandarin, and the Mole Man, all under the control of Dr Doom.  Doom then seeks out Namor as his ally, and he gives him a Magnetic Grappler.  Namor then goes to the Peace Building and plants the Grappler, only to have Doom betray him and lift the building into space, where he plans to send it into the sun.  Namor manages to launch himself to Doom's ship, where he defeats Doom and sends him adrift, and he then sets the ship and the building back on Earth.

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images courtesy of Superhero Cartoon Database