'Avengers Endgame's true savior could be a new superhero

While most of the speculation surrounding 'Avengers: Endgame' seems to be around the introduction of alternate dimensions and the use of time travel, a compelling new theory suggests that Marvel might have a new trick up its sleeve.

MCU Cosmic founder Jeremy Conrad suggests that the key to saving those were lost during the Decimation - Thanos' wiping out of half the universe's population - doesn't entirely rest on the shoulders of the Time Stone or the Quantum Realm. Instead, he said in a recent tweet that he has heard that Marvel is planning on introducing a never-before-seen character, perhaps as a savior figure in 'Endgame'.

"There's been some hinting and talk about Black Knight recently. Apparently Marvel does have a plan for him in the MCU, and they already know how he'll be introduced," Conrad wrote, adding an image of the Quantum Realm, suggesting perhaps that the Black Knight is trapped in it.

The character was first introduced in 1955 as a Knight-like figure, and has undergone several versions, including as a supervillain and as a member of the 'Avengers'.

It has previously been speculated that 'Captain Marvel', played by Brie Larson, will be the one to save the fallen 'Avengers in Endgame' - or at least Tony Stark, who is trapped in space, according to the film's trailer. 'Captain Marvel' will in March feature in her solo movie mere months before the release of 'Endgame'.

There have also been rumors surrounding the introduction of Adam Warlock, now that the MCU has expanded into the cosmic realms. Most recently, actor Hugh Jackman was rumored to be playing the role. It was Conrad himself who refuted that theory.