The character first appears in The Sentry #1 (September 2000), and was created by Paul Jenkins and Jae Lee with uncredited conceptual contributions by Rick Veitch. Les Nouveaux Vengeurs l’invitèrent en tant que membre, pour pouvoir garder un œil sur lui mais aussi pour ses fabuleux pouvoirs.Pendant la guerre civile, Sentry se trouve du coté de Iron Man et donc pour la loi de recensement des surhumains. Thor wrapped the Sentry's charred corpse in his cape, flew him into space, and dropped him into the Sun.During the fight Thor, whose consciousness returned from the future where the Apocalypse Twins won, tried to convince Sentry of helping them to save the Earth from destruction as secretly planned by the Twins. Robert and the Void battled each other, the former reminding the Void of their deal. Catherine, though, refuses to give up and leaves. Following a short skirmish where the Sentry had the upper hand, he ripped Ares in half from head to toe to the shock of everyone on the battlefield. Over ten years later, Robert Reynolds, a meth addict, broke into the laboratory of Project: Sentry, appalled at what their irresponsibility had wrought, persuaded Reynolds to let them test his powers at their facility, but they could not contain him for long, nor curb his desire to use his powers for the greater good of all, and the Sentry debuted before a world that had almost forgotten superhuman Samaritans. She held the Void within her while he fled the battlefield. Sentry s'envole alors vers saturne et lutte contre Void dans son esprit.
His initial plan fails, and Vincent figures out his handler is trying to kill him. The Skrulls had invaded New York City and one of them had broken into his Watchtower, threatening Lindy.
In 1989, Reynolds, along with friends Raul Malo and Paul Deakin, founded The Mavericks.
After pleading for his death, Bob turned back into the Void and was swiftly killed by Thor. Sentry a l'avantage dans son combat contre Thor, jusqu'à ce que Norman Osborn a perde le contrôle de lui même et demande a Void de faire tomber Asgard. 's urging, Reynolds' psychiatrist Dr. Cornelius Worth entered the vault and found only a chair and a mirror. She departs, leaving Gabe & Reynolds alone. An enraged Sentry attacked Ultron once more, but in an exchange of blows was knocked away.The next day, a symbiote attack infected everyone in Robert joined his Mighty Avengers teammates as they discovered a Skrull ship that contained 1970's versions of a large group of heroes.
Catherine argues that's not true, because Vincent is a better person since he tried to kill Reynolds. Il fait ses débuts à Broadway dans Look, We've Come Through. Catherine is devastated, but Vincent reminds her that Reynolds died helping them out, the way he wanted to. However, the formula makes Liam think Catherine is Rebecca, and he is determined to kill Vincent & Catherine the way he killed Rebecca & Alistair. Ses pouvoirs semblent basés sur une distorsion de la réalité. The Sentry battled the ship's Vision, who morphed into the Void and told Robert that the invasion was Robert's punishment for those who forgot him.
When Cornelius confronted Reynolds with this, Reynolds became confused and ran to the fairgrounds where he first gained his powers. Reynolds later tells Vincent that he'll give him the information if he breaks up with Catherine. Vincent agrees, and Reynolds gives him information on his handler's next target.
During the course of the battle, Iron Man hacked into Having returned to the world, the Sentry captured the hearts of the public, with newspapers referring to him as "the Golden Guardian", and he saved hundreds of lives on a daily basis; Reynolds' psychological problems, however, had worsened. He has a trap set to kill both Vincent & Tori. After a relentless assault against him, the Void killed Loki to prevent him from further using the stones. Several failed attempts were made to kill him. The Sentry was contacted by two film-makers, who wished for him to assist them in making public service announcements. He knew that if Reynolds believed that he believed the Void to be in the Watchtower, the Void The Sentry then visited Dr. Plus tard, le vrai Sentry vas arriver sur le champ de bataille et commencer a combattre Hulk dans un duel qui dévastera New York. Robert then tried to kill himself by flying into the sun, but it did not work.