1:23
Some of Downey's fellow Avengers also took to the comments to share their excitement.
Mark Ruffalo (Bruce Banner/The Hulk) wrote, \"Hey, Brat: Green suits you,\" while Jeremy Renner (Clint Barton/Hawkeye) wrote, \"Bring the DOOM!\"
Downey isn't the only one returning to the MCU. Joe and Anthony Russo, who directed \"Avengers: Infinity War\" and \"Avengers: Endgame,\" are back for the next two Avengers films.
The Russo brothers themselves took to the \"Oppenheimer\" actor's post on Saturday to tease, \"Green is your color.\"
Marvel Studios is owned by Disney, the parent company of ABC News.
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