The Avengers #264

Black Knight and Wasp study the changes in her powers. Captain Marvel helps her father fight a fire. Namor is still adjusting to his life as an Avenger. A young woman successfully steals Hank Pym's Yellowjacket costume and modifies it. Unfortunately, she doesn't have the chance to use it since she is brought in by the Wasp.

1st appearance of Yellowjacket II