Aliases: Janet van Dyne
The Wasp is a character with a lot of great KO's. A member of The Avengers, she frequently played the role of damsel in distress. In her insect form, she was easily gassed by villains.
Taken from Wikipedia:
Making use of sub-atomic Pym particles, the Wasp possesses the power to alter her physical size, causing her body's mass to be shunted to or gained from an alternate dimension known as Kosmos. She is able to shrink to a minimum of half an inch or grow to a maximum of several hundred feet. Smaller or larger sizes are possible but the exertion begins to put a strain on her body. Intitially, these abilities stemmed from use of a Pym particle gas released from special capsules. Over time, however, her body has absorbed enough particles to allow her to alter her size at will.
At miniature size, her strength level increases as her body's mass is compacted. At giant size, her strength and endurance increase geometrically with her height, reaching superhuman levels. Despite the advantages of giant size, Janet usually prefers to remain the diminutive Wasp, calling on her growth power only in times of extreme emergency.
At miniature size, the Wasp grows a pair of translucent insect wings from her back, a result of genetic modifications provided by Hank Pym. These grant her the power of flight, at speeds up to 40 MPH.
The Wasp is able to harness and augment her body's natural bio-electric energy, releasing it from her hands in powerful electrical bursts, which she calls her "stinger blasts" or "wasp's stings." Originally, she required special wrist devices to produce these but again, Pym particle absorption has allowed her to create the ability unaided.