The Wasp is a member of The Avengers (Captain America, Iron man, Thor, …). She is able to control her size, either to shrink to the size of a bug or to grow very large. She is also able to fly, control bugs telepathically, and shoot people with blasts of energy. She is also married to Ant-Man, another Avenger.
Here is a segment of an episode featuring the wasp the Disney cartoon of the Avengers
And this is another fan vid with pictures of the Wasp