Invisible Woman

Sue Richards, also known as Invisible Woman, is a member of the Fantastic Four.

The Avengers: Earth's Mightiest Heroes
At some unknown point, Sue was replaced by a Skrull imposter. She was constantly sedated by her Skrull captors to stop her from using her powers. When Captain America assembled the other prisoners to get their freedom and return to Earth, refused to leave the weakened Sue despite Viper telling she would be a load.

She somehow saved her teammates and the whole Baxter Building from her doppelganger.

Some time later, she was part of the Avengers' expanded team against Galactus.

Hulk and the Agents of S.M.A.S.H.
Sue appeared as one of the Collector's prisoners.