Fans of the Marvel Universe have been eagerly awaiting the release of Avengers: Endgame ever since we saw the devastating final scenes of Avengers: Infinity War last year.
The film premiered in LA last night and naturally the cast have been promoting the film over the past few weeks.
They teamed up with Jimmy Fallon for what can only be described as one of the greatest feats of writing since the beginning of time.
They somehow managed to cram the names of pretty much every Marvel character into Billy Joel's We Didn't Start The Fire.
Paul Rudd, Samuel L. Jackson, Robert Downey Jr. and Brie Larson are just some of the famous faces that appear in the video.
But most importantly, there's a Groot reference.
You can watch the video below - but just know the song will be stuck in your head all day.
Avengers: Endgame will arrive in Irish cinemas on Thursday April 25th.