Fantastic Four against the Frightful Four again, and then assisted the Fantastic Four against Namor the Sub-Mariner. Her time travel from 23rd Century Femizonia, an alternate future Earth ruled by women, to prevent the formation of Machus, a planet in her alternate future dimension ruled by men, was finally revealed. Alongside the Fantastic Four, she battled Mahkizmo. She ultimately remained in the 20th Century after a dimensional interface of Femizonia and Machus occurred. She later assisted the Fantastic Four and Tigra against the Frightful Four, and then assisted the Fantastic Four, Tigra, and the Impossible Man against the Brute, Mad Thinker, and Annihilus. Thundra later met wrestling promoter Herkimer Oglethorpe, and on his advice she became a professional wrestler training with the Grapplers, a group of female wrestlers who possess cybernetic-endowed superpowers. In a fixed wrestling match with one Grappler member, Thundra (who has superior strength and fighting skills) is secretly drugged by her opponent, causing her to black out and lose the match. When she awakens, it was revealed that the Grapplers were actually agents working for the Roxxon Oil Company, a multinational petroleum company which was covertly involved in developing advanced technology and weaponry for sinister motives. The Grapplers were assigned to trick Thundra into helping them sabotage Project Pegasus, a prison/research facility built for housing supervillains. They were employed to smuggle the Nth Projector out of Project Pegasus. As a result of the deception by Roxxon and the Grapplers, Thundra came to blows (yet again) with the Thing (in whom she has expressed a romantic interest, on more than one occasion). Alongside the Thing, Quasar, Giant-Man, and the Aquarian, she fought the Nth Man. She encountered the duplicate Hyperion and the Avengers, and battled Ms. Marvel. She is briefly allied with the duplicate Hyperion while still in service to Roxxon, and with him stole the Nth Projector from the Nth Command, before she returned to an alternate Femizonia which did not interface with Machus. Sometime later, Thundra was revealed as the Empress of Femizonia. She teamed with the Thing to battle Machan rebels. She later abducted the Avengers and Fantastic Four to the future to enlist their aid in defending Femizonia from the extra-dimensional warlord Arkon and his warriors from Polemachus. She fought Arkon in personal combat, and became romantically inclined toward him. However, Thundra has a special place in her heart for Ben Grimm. In addition