Punisher (Yost Universe)

Punisher is a superhero vigilante who hunts down and eliminate criminal elements on his own.His real name is Frank Castle.

Biography
His name was mentioned in the newspaper about him read by a taxi driver in break time before his cab was blown off by Whrilwind who was chased by Wasp and Ant-Man in the streets of New York.

More of him will be revealed in Season 2 of the Avengers Earth's Mightiest Heroes.