HistoryHeather's history is basically the same as her male Earth-616 counterpart, except Heather never struggled with the evil personality of the Void, and has always retained complete control of her sanity, never becoming a threat to existence. She is one of the most powerful superheroines in all of existence.
Powers and Abilities
Lady Sentry's powers ostensibly derive from the Super-Soldier Serum that "moves her molecules an instant ahead of the current timeline." This was designed to be a hundred thousand times stronger than the original used on Captain America, and was modified by Weapon Plus. However, she has suggested that the Lady Sentry is a sentient life-force, a refugee from another universe which attempted to break through to another one for her new home, and that this was merely accommodated by the serum.
Although the character's exact abilities and their limits are unknown and also said to be omnipotent, she has shown a small portion of her powers by lifting a Helicarrier (with assistance from Captain Marvel and Beta Ray Bill); preventing the Celestial Exitar from crushing the Earth by lifting his foot (with the help of an empowered Hercules) although later she was seen carrying him alone; also seen effortlessly toying with Thor, sending him flying with punches that produced shock waves felt around the planet. She dispatched Toxin with little effort. Lady Sentry is considered by Emma Frost to be one of the best telepaths, telekinetics and pyrokinetics on her Earth. She showed psychic power comparable to that of Jean Grey empowered by the Phoenix Force. She proved able to resist Rogue's mutant touch, effortlessly defeating Morg and breaking the handle of his axe, which was powerful enough to slice planets in half; severely pummeling and nearly tearing apart Ultron; and easily shattering the shields of Doctor Doom. During Lady Sentry's initial appearance, Spider-Man recalled that she fought and stalemated Galactus at one point.
She generally holds back her powers, greatly restraining her full might. On occasion, she has unleashed it, showing the true magnitude of her abilities and strength. On some of these occasions, she overloaded the abilities of the Absorbing Man; and fought an enraged She-Hulk for a prolonged period of time until both fighters reverted to their human forms, whereupon Heather was knocked unconscious. She possesses superhuman speed, making her easily able to evade or catch bullets; and through flight she can travel to the sun and back in a matter of minutes. Lady Sentry is also apparently invulnerable: Spider-Woman's venom blasts, capable of killing gods, have no effect on her. Nick Fury has stated that S.H.I.E.L.D. has not yet found a way to kill her. Iron Man's scanners have found no physical weaknesses in her body.
Lady Sentry also has superhumanly acute senses. She once told an opponent that she could see his nerve centers, and on another occasion said she can hear the heartbeat of a butterfly in Africa while she was in the U.S. She can emit light, which can be used for a pacifying effect. She possesses the ability to absorb energy from any matter/source, which provides her limitless energy. Lady Sentry also demonstrated the ability to create immensely elaborate solid light constructs far superior in power and effectiveness to Quasar. Lady Sentry possesses tremendous powers of energy projection, from both her hands and eyes, capable of harming even the Hulk (in his Green Scar incarnation), who has withstood the equivalent of solar flares unharmed, and also released planet-destroying energy against Gladiator of the Shi'ar. Lady Sentry her also at times demonstrated the ability to instantly teleport herself away in a blinding flash of light.
Lady Sentry was once able to implant her memories inside another person's mind, and after Ultron murdered her husband, she was able to resurrect him by simply touching him. She does not need to eat, drink, rest, sleep, she does not age and is for all intents and purposes functionally immortal. She is immune to all known terrestrial diseases, poisoning by natural or magical toxins, and has high resistance to attacks based on psychic, mystical, divine powers and cosmic.
Lady Sentry possesses the power to atomically restructure organic and inorganic matter into the configuration she desires and can transmute elements, vast amounts of matter, or living beings into whatever she wishes. She has demonstrated the ability to recreate herself after bodily destruction, up to and including total molecular destruction within seconds. In the same way she can completely disintegrate living beings at the molecular level.
She has also been shown to possess powers comparable to those of Molecule Man. She eventually found out that all her powers apparently derive from abilities similar to those of the virtually omnipotent Beyonder, which she used to take control of his body and resurrect herself multiple times after seemingly being annihilated.
As Lady Sentry's molecules are ahead of the current timeline, this implies that she simultaneously exists in the future, present and past altogether. Her longtime foe, Cranio Woman stated that time bends for Lady Sentry, and every situation that happens all works in her favor, sort of like probability manipulation but in her case, just over time.