Ka-Zar has come to visit his old friend Tony Stark, because hey, Marvel Universe.
Unfortunately, the Fixer has shown up, trying to steal the secrets of Iron Man's armor. And he's captured Ka-Zar, so now Tony has no choice:
Fortunately for his modesty, Tony has one trick left up his...up his...well, up his something!
But after some running around, well, the final victory goes to the real Thunder From (Way) Down Under:
From Iron Man # 202 (1986)