Topic summary
Malice, the Mistress of Hate

Extracted from the Wikipedia article Invisible Woman.
Invisible Woman
Susan eventually becomes pregnant for a second time. However, this second child is stillborn due to Susan having been exposed to radiation inside the Negative Zone. A depressed Susan is manipulated by Psycho-Man into becoming Malice, the Mistress of Hate. As Malice, Susan attacks her friends and family in the Fantastic Four, utilizing her abilities at power levels she had never displayed previously. Reed saves Susan by forcing her to hate him legitimately. Susan (off-panel) does something to Psycho-Man, causing him to let out a terrifying scream. After she rejoins her teammates, Susan states that Psycho-Man will never hurt anyone ever again. Susan is profoundly affected by the entire episode, and changes her code name from "Invisible Girl" to "Invisible Woman". Along with Reed, she briefly leaves the Fantastic Four and joins the Avengers. The two of them rejoin the Fantastic Four before long.