Who Is MCU's Sentry?

The upcoming "Thunderbolts" film from Marvel Studios will feature one of the most interesting and convoluted character Marvel Comics has ever produced, the Sentry.

Most comic followers will refer to his as Marvel’s Superman, but with a dark secret. He'll be portrayed by actor Lewis Pullman in the upcoming MCU film. But who is Sentry, a (relatively recent) Marvel character, and what is his strange origin story, both on and off the page?

The Sentry began his comic book existence as an elaborate trolling by Marvel Comics editorial. Back in the ’90s, the Marvel Knights line of comics helped save the company after bankruptcy. Edgy titles like Kevin Smith’s Daredevil got critical acclaim and big sales.

In 2000, creators Paul Jenkins and Rick Veitch came up with the Sentry series for Marvel Knights, about a superhero in a more classic DC Comics mode than a Marvel one. His costume suggested Superman’s, or Shazam’s. Although he’s not the only analog for Superman at Marvel (Hyperion predates him) he is the most powerful. He may be stronger than Superman himself.

When the Sentry mini-series was announced, Marvel touted the series as a discovery of a "lost" concept by Stan Lee and a forgotten artist named Artie Rosen from the early ’60s that never made it to print.

When Rosen "died" in 1999, writer Paul Jenkins discovered his original creation with Lee, a classic hero named the Sentry. He decided it was time to give the hero a proper Marvel debut in his own mini-series.

In the Sentry original limited series, we meet Robert Reynolds. He’s an out-of-shape, middle-aged man living a bleak existence. Reynolds starts remembering a superhero career in his younger days, when he was the Sentry. Having taken "the Golden Sentry Serum," an advanced version of Captain America’s Super Soldier Serum, he now had "the power of a million exploding suns."

His arch nemesis was a dark presence called "The Void." He was a contemporary of early Marvel heroes like the Avengers, Spider-Man, and the Fantastic Four. In fact, he was very close friends with Reed Richards, the Fantastic Four’s genius leader. As he encountered each Marvel hero in the present, they all slowly began to remember him. But why did they forget him in the first place?

After a deadly attack by the Void that resulted in high casualties during his heroic heyday, Sentry disappeared from the Marvel Universe when his mind was wiped, along with the memories of everyone on Earth, to make everyone forget that he ever existed. This was because of Reed Richards and Doctor Strange realizing that the Void was not just Sentry’s arch-foe, he was also a part of him.

The only way to get rid of the Void was to make everyone forget that both Sentry and Void existed, including Bob Reynolds himself. So for years, he lived a life of anonymity, forgetting his heroic past entirely.

Ultimately, X-Men telepath Emma Frost frees Reynolds from the psychic virus implanted by Mastermind and restores his memories, and the Sentry joins the Avengers. The rest of the world does not regain their memories of Sentry. To them, he’s a brand new hero and new addition to the Avengers.