Fans believe that Marvel has established a connection between the logos of all the Avengers movies and the infinity stones.

Not all of the Avengers in Doomsday were revealed in the cast announcement. Carol Danvers (Brie Larson) will be working with Hulk (Mark Ruffalo) and Wong (Benedict Wong) to bring back Monica. Similarly, Kamala Khan (Iman Vellani) will be trying to find young heroes while also trying to use her bangle to bring Monica back home.

"A variant (lifeboat saved) Thanos would see usurping God Emperor Doom’s power as a potential source of Infinity Gauntlet power. So they duke it out which would then be a cinematic reversal of the actors battle in Infinity War."