Ryan Reynolds' Merc with a Mouth became a part of the Marvel Cinematic Universe with the beginning of its Phase 5 and the release of Deadpool and Wolverine. Since then, there has been plenty of speculation about the Marvel Jesus being part of other movies, especially the upcoming Avengers: Doomsday, poised to unite heroes old and new. His potential return remains one of the MCU’s most talked-about mysteries.

As anticipation builds for the fifth installment, fans are eager to know which iconic characters—and whether Ryan Reynolds' beloved Deadpool—will join the film’s star-studded cast.

Ryan Reynolds’ participation in Avengers: Doomsday remains unconfirmed officially. While he has expressed openness to joining the MCU’s future projects, the cast announced so far does not include him or Deadpool by name. Marvel Studios president Kevin Feige has indicated the cast list is not yet complete, leaving the door open for potential additions. Reynolds seized the opportunity to transform the lesser-known, unconventional antihero into a cultural phenomenon. Reynolds himself hinted positively about future involvement during public appearances, fueling anticipation among the public eager to see Deadpool team up with the Avengers.

During Reynolds’ appearance at the 2025 Time 100 Summit, Ryan Reynolds was almost inevitably asked about his involvement in Avengers: Doomsday and Avengers: Secret Wars. In a discussion with Time correspondent Eliana Dockterman on the Business of Creativity panel, he responded, “I do think so.” He then reflected on his experience filming the Deadpool movies and expressed eagerness for potential future appearances. While the Spirited actor's return is in the shade, many others will be appearing in the upcoming Avengers movies.

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Despite the current lack of formal confirmation, the extensive cast includes many notable Marvel veterans and X-Men alumni, suggesting a broad crossover event. This leaves Reynolds’ inclusion possible but unverified, maintaining a buzz of hopeful speculation.

Avengers: Doomsday is confirmed to feature Robert Downey Jr. returning as the antagonist Doctor Doom, alongside a massive ensemble cast including Chris Hemsworth as Thor, the Apple Original Film star, Tom Hiddleston as Loki, Patrick Stewart as Professor X, and many others reprising beloved Marvel roles. The film unites major groups like the Avengers, the X-Men, and the Fantastic Four, promising an intense showdown against Doctor Doom’s formidable threat.

The Russo brothers are directing the film, shaping a story destined to continue the MCU’s epic saga with high stakes and unexpected alliances. Filming is underway in England and Bahrain, heightening expectations that Avengers: Doomsday will deliver an entertainment experience after Avengers: Endgame. As the intrigue soars high, the possibility of more characters, both new and old, joining in, along with Ryan Reynolds' Deadpool, remains a probability as well.

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 Are you equally eager to see Ryan Reynolds’ appearance in Avengers: Doomsday? Let us know in the comments below.