Hela is a Marvel Comics villain who appears in the [animated series The Avengers: Earth's Mightiest Heroes. She was the ruler of Niffleheim, the land of the dead. Captain America was transported into her realm and she tried to convince him to stay. Hela was well aware of her father Loki's plans and played along with them, but knew her father very well, and was aware of eventual betrayal.
Hela negotiated with Captain America and transported him to Asgard to aid his team, on the condition that should he fall in battle, his soul would belong to her.
At the Mansion, Cap saw a reflection of Hela on his broken shield just before he was ambushed by a Skrull imposter.
This version of the mythological Hela was created by Stan Lee and Jack Kirby.