Even as ABC considers a spinoff of Once Upon a Time focusing on the Mad Hatter, the network is on the lookout for a new actor to play the part.

The Live Feed reports that Sebastian Stan, who's had a recurring role since last year, won't be returning, apparently because of his commitments to Marvel's Captain America: The Winter Soldier. Stan appeared as Bucky Barnes in 2011's Captain America: The First Avenger, and will have a significantly larger part in the sequel.

It's certainly inconvenient for ABC and its fairy-tale drama, but turnabout is fair play: After all, Marvel had to recast the role of Fandral in Thor: The Dark World last year because of Josh Dallas' commitment to Once Upon a Time.The spinoff is reportedly in the early stages, with ABC still deciding whether to approach the project as a backdoor pilot. A series would be targeted for fall 2013.