History
The history of this incarnation of Robert Reynolds, a.k.a Sentry, most likely mirrors that of his Earth-616 counterpart.
Sentry was first briefly seen flying over New York City when the Power Family arrived there by plane. However, he did not show up for the fight against Kang the Conqueror for some reason.[1]
Sentry was among the many New York superheroes that responded to a rampage seemingly caused by the Hulk (in reality, it was caused by the Abomination, who had been defeated by Hulk and Power Pack shortly before the heroes arrival). Wanting to be left alone, Hulk angrily attacked the heroes, forcing them to fight him. Like all the others, Sentry found himself outmatched by the green giant until Katie Power used her powers to revert Hulk back to Bruce Banner.[2]