"Yellowjacket" is the forty-fourth episode of The Avengers: Earth's Mightiest Heroes.
Plot[]
A mysterious explosion seemingly kills Hank Pym in his college laboratory, but as the Avengers and their friends mourn the loss of their fallen comrade-in-arms, a fearless new vigilante named Yellowjacket - endowed with the same powers and technology as Ant-Man/Giant-Man and Wasp - begins taking out the members of the Serpent Society.