Two days after the Russo brothers teased the Avengers: Doomsday teaser trailers were hiding clues, one fan might have cracked the code. A Reddit user (via IGN) has theorized that the numbers at the end of each trailer that flicker before the countdown correspond with timecodes for Avengers: Endgame. Specifically, each Endgame timecode ties into a plot point that will be picked up in Doomsday.