Following reports earlier this month suggesting Sylvester Stallone will appear in Guardians of the Galaxy Vol. 2, a new rumor has surfaced with details on his possible costume, as well as claims regarding the return of another Marvel character.

Warning: Possible Guardians of the Galaxy Vol. 2 spoilers ahead.

An anonymous source from the set of Guardians Vol. 2 told On Location Vacations Stallone is indeed in the movie and has been filming scenes in a costume that "looks a lot like Judge Dredd."

Additionally, the source said a scene featuring Howard the Duck was shot last week, adding weight to the ongoing speculation that the infamous Marvel character will return following his post-credits cameo in the first film.

Guardians of the Galaxy Vol. 2 is directed by James Gunn and opens in theaters on May 5, 2017.