While Brie Larson’s first official adventure in the Marvel Cinematic Universe doesn’t arrive until March, the road to Captain Marvel began back in April, in the post-credits scene at the end of Avengers: Infinity War. The scene in question saw Thanos’ snap ripple throughout Earth, leaving Nick Fury, just before he disappears, to take out a pager and send out a call to Brie Larson’s Captain Marvel.

This of course left fans with the biggest question, “Why now?” Why did Fury wait until half of the universe had been wiped away before trying to get the Avengers a little extra help? It seems strange, but now we finally have an answer.

On Wednesday, Marvel Comics released Captain Marvel Prelude #1, which helps lay the foundation for Carol’s anticipated arrival in the MCU. While Captain Marvel doesn’t actually appear in the story, the comic sheds some light on Fury’s relationship with her, where he shows Maria Hill the pager for the first time. He tells her that he wants to avoid having to call her, and save her to be a last resort. Captain Marvel really is the MCU’s silver bullet.

Marvel.com spoke with Pilgrim about filling in these vital story moments, visiting Captain America, Falcon, and Black Widow on a secret mission, and uncovering what was going through Nick Fury’s mind when he finally gave Carol the call.

“Carol’s the biggest gun you’ve got and Fury’s never one to waste a silver bullet, so if he’s finally making that call after all this time and after all he’s faced alongside the Avengers, then he’s truly seeing the situation as a last resort,” Pilgrim said.

The only question that remains now is why Captain Marvel left earth. We know that her solo film will see her locked in battle that includes the Kree and Skrull alien races, but the reason for her not being on our little planet is still up in the air.

Captain Marvel is set to hit theaters on March 8, 2019.