Oscar Isaac might just be returning as Moon Knight ... Robert Downey Jr’s hair after the Iron Man actor recently sent out a Doctor Doom-themed invitation for this 60th birthday party.

Today, we've learned that Isaac has dropped out of the event "due to changes in ... Due to changes in his production schedule, Oscar Isaac is no longer able to attend Star Wars Celebration Japan.

From the moment he broke through in 2013’s Inside Llewyn Davis, Oscar Isaac has been one ... and regal patriarch hunk in Dune. And last night at Gotham Awards, Isaac unveiled a whole new hunk ...

He's assembled an incredible cast which includes Jacob Elordi as Frankenstein's monster, Oscar Isaac as Victor Frankenstein ... the actor was forced to pull out due to scheduling conflicts ...