We met "Bob" twice in two Thunderbolts* trailers. While many Marvel Comics fans know a handful of anecdotes about Robert Reynolds, we know even less about "The Sentry."

And then, there's "The Void," which, if most fans are honest, is still a mystery.

If this makes sense, The Sentry is a persona from deep within Bob, thanks to the Golden Sentry Serum mutating his genetic code to something remarkably closer to Kryptonian. Yet, The Void is a persona of The Sentry, not Robert Reynolds. And it is one of the most malevolent forces in the known universe.

Villains are bad. Some are fierce. But The Void is no holds barred evil and he stops at nothing to protect The Sentry. Marvel defines this halfway split like this: "The Void believes he is integral to the Sentry's survival. As the Sentry's power hinges on his emotions, any individual could crush him...