Iron Man [Tony Stark]; The Guardsman [Kevin O'Brien [as Kevin O'Brian] (introduction as Guardsman)] (first appearance; origin); Mikas (villain; death); Mr. Kline (villain)
Giant-Man [Hank Pym]; Wasp [Janet van Dyne]; Black Knight [Nathan Garrett] (introduction, origin)
Synopsis:
After being arrested for treason by Giant-Man, Professor Garrett flees to Europe where he manipulate the genes of horses and eagles to create a winged horse. Then he develops his lance and comes back as the Black Knight to take his revenge on Giant-Man. Giant-Man defeats him, but the Black Knight escapes.