"They finally figured it out -- keep me in a strait jacket and I'll be fine," Stamos joked in his suit of armor costume.
The series is part fairytale, part Broadway musical that follows a dashing hero, Galavant (Joshua Sasse), who loses the love of his life, Madalena (Mallory Jansen), to the evil King Richard (Timothy Omundson) and must take revenge to restore his "happily ever after." Stamos guest stars as Galavant's rival, Sir Jean Hamm.
As is the case with most fairytales brought to screen, the roles required the actors to break out their best English accents.
"I ended up somewhere between Richard Burton and Dick Van Dyke and Mary Poppins," said Stamos. "That was a challenge and I loved all the physical stuff. In this scene that we're doing here, Galavant's sidekick Isabella [Karen David] gets me drunk, because she fears that I will beat him in the joust."
With the production being on such a grand scale (the budget has been reported at nearly $7 million), ABC seems to be taking a big gamble on the show's success.
"Basically, Galavant is trying to pull from fans of Once Upon a Time because it's filling that slot, and also Glee and it's kind of smushing it into together in this medieval musical world," said ETonline's Leanne Aguilera. "It's just really fun."
"This actually may be the most fun I have had in a long time working on anything," he said. "It's better than I imagined it would be. I sound like I'm kissing ass. I don't need this job, but I'm happy about it."
Galavant premieres on Jan. 4 with back-to-back episodes on ABC at 8 p.m. ET/PT.