33 important questions 'Avengers: Endgame' needs to answer

• Warning: There are potential spoilers ahead for "Avengers: Endgame."
• "Avengers: Infinity War" left us with a lot of questions, including whether or not we'll see the characters who vanished come back.
• INSIDER rounds up the burning questions we hope "Endgame" will answer. 

"Avengers: Endgame" is in theaters Friday, April 26, and you probably have one main question on your mind. How are our heroes going to undo Thanos' devastating snap which wiped out half of the universe from existence?

But we're hoping it will answer many more questions left unanswered from previous Marvel movies. After all, "Avengers: Endgame" is the culmination of more than a decade of films in the Marvel Cinematic Universe.

Has Bruce Banner figured out what's going on with the Hulk? What happened to Sharon Carter? And what about Valkyrie? And is Tony ever going to get married to Pepper?

INSIDER has been going through the 21 movies in the MCU and rounded up the questions — both major and minor — that we hope are addressed in the three-hour long "Endgame." 

Are the characters who vanished really gone or can they be brought back?

This is the biggest question from "Infinity War." Will the remaining heroes be able to undo the Mad Titan's life-altering snap? We certainly hope so. After all, Doctor Strange did tell Tony Stark that giving Thanos the time stone was, presumably, the only way to save humanity. 

Also, it's kind of tough to imagine that there's a "Guardians of the Galaxy Vol. 3" without the majority of the group's members. We've also seen a very much alive Tom Holland in the trailer for this summer's "Spider-Man: Far From Home." 

Disney just announced that Wanda, Vision, Falcon, Bucky Barnes, and Loki — characters who were all killed or lost in "Infinity War"— will be getting their own shows on the company's upcoming streaming service, Disney Plus. Who's Marvel fooling? We'd be surprised if most of the heroes who vanished (if not all of them) don't return at some point in "Endgame."

Read more: Where every major Marvel character is after the "Avengers: Infinity War" snap

How are the Avengers going to try and bring everyone back — are they time traveling?

It's been heavily speculated time travel will be a part of "Endgame" due in part to paparazzi set photos from filming that showed Ant-Man with Iron Man back during the events of "The Avengers."

That theory sounds more convincing after seeing the first set of official "Endgame" toys from Marvel and Hasbro. The action figures wearing new Avengers' suits are fitted with a small blue device on their hands. We're betting those gadgets (and new suits) are going to help the Avengers travel back in time to undo the events of Thanos' life-altering snap at the end of "Infinity War."

Read more: How time travel could play a part in "Avengers: Endgame"

Is the group going to revisit Project Pegasus? "Captain Marvel" made the secret program seem extremely important. She and Tony Stark may hold the keys to it.

A lot of "Captain Marvel" is spent telling viewers about Project Pegasus, aka P.E.G.A.S.U.S. (Potential Energy Group/Alternate Sources/United States). Wendy Lawson was trying to figure out how to harness the energy of the Tesseract — the cube which held the blue Infinity stone — to create a light-speed engine.

Read more: Our guide on the Infinity Stones and what you need to know about them

If you revisit the first few minutes of "The Avengers," Nick Fury, Dr. Erik Selvig (Stellan Skarsgård), and Clint Barton/Hawkeye are working on Project Pegasus and are trying to unlock its capabilities.

There's another important moment where Project Pegasus may have been referenced in the MCU. Revisit the scene where Fury is speaking to Tony Stark about his father. Fury says Stark's father, Howard, was working on something huge that would've changed the course of history. Tony later winds up making a new element to help himself stay alive. However, I think Fury may have been speaking about Pegasus. 

Stark also worked on the secret project where he studied the Tesseract, but couldn't crack it. What better way to honor Lawson and Howard Stark than by having Carol Danvers/Captain Marvel and Tony finish the work started years ago by building the light-speed engine. 

That may just enable them, in part, to travel back in time. If you're still unsure, Project Pegasus is also the name of an apparent real-life CIA project that was involved in looking into teleportation and time travel.