Jonas' head for "experiments." Sirena Ong: (voiced by Cristin Milioti) The daughter of Wide Wale and budding love interest of Hank. Because of her father's mutation, she has inherited a number of whale-related physical traits, such as the need to regularly have her body in water and the ability to breathe underwater. She is blunt and temperamental, and although she understands her father's overbearing love for her, she is easily irritated by his henchmen when they try to keep her under control; she bears a particular dislike for one henchman named Rocco. She once dated Brown Widow prior to dating Hank, but broke up with him. Hank's good-natured efforts to impress her with the aid of Billy, Pete and Dean lead her to further develop deeper feelings for him because of how genuine he is. In Season 7, she and Hank are a couple now but she has to face her father's overprotectiveness and his lack approval in Hank. She also meets her uncle Douglas and is angry her father never told her about him. It is revealed in the mid-finale, she has cheated on Hank by sleeping with his brother Dean. The Impossibles Sally Impossible (voiced by Mia Barron): Richard's estranged wife. She has invisible skin which leaves her muscle tissue visible and requires all her concentration to keep her skin visible. Sally developed, and still maintains, a crush on Dr. Venture, who was repelled when he discovered her condition. Richard has implied that she has been repeatedly unfaithful and that her newborn son might have been fathered by someone else. This is a reference to the Invisible Woman's relationship with the Sub-Mariner, who has pursued her romantically from their first encounter. Eventually, it came to the point where Richard was keeping Sally practically as a prisoner in their home and keeping her under constant guard, accurately suspecting that she wanted to run away from him. Sally has been dating Jonas Venture Jr. and resides on Spider Skull Island with the rest of the Impossibles, sans Richard and Cody, though it is hinted that she and JJ are having troubles due to the latter's inability to commit. In "All this and Gargantua-2", however, her and JJ's strained relationship finally breaks and she decides to leave with Rocket and Richard, though she implies that she and Richard's relationship will be one of shared custody over Rocket rather than anything romantic