Iron Fist (1975 1st Series) #12
Published Apr 1977 by Marvel.

"Assault on Avengers' Mansion!" Part 2 of 2. Guest-starring Captain America and Misty Knight. Story by Chris Claremont.
Art by John Byrne and Dan Adkins.
Iron Fist has come to Avengers' Mansion seeking help against the Wrecking Crew, but his reputation as the "Kung Fu Killer" (see IF #10) precedes him. Now, Iron Fist must go one-on-one with perhaps the ultimate fighter, Captain America. Meanwhile, Misty Knight is in the clutches of the Wrecking Crew and her time is running out.

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