Heroman's utter, total defeat of Dr. Minami. And the fact that he saves him makes it all the more win.
Also, Joey's arrival to the Washington D.C. battlefield, which involves jumping out of a damaged transport plane over the war-torn city into a wall of anti-aircraft plasma blasts, before surfing on the back of his Humongous Mecha partner into the Horde of Alien Locusts below. Kid knows how to make an entrance.
The villains aren't devoid of their own either, as Kogorr demonstrates in episode 25. You don't normally expect someone who's gone One-Winged Angel to fight smart at all, let alone fake a weak point just to draw the hero into impalement range. Better yet, the ruse works.