Tom Hiddleston posted a video to Twitter Wednesday that may have confused fans. While there has been plenty of buzz about the new Loki TV show for Disney+, Hiddleston’s promo video wasn’t actually for a project on the big or small screens.

The moody video shows Hiddleston walking through a graffiti-covered tunnel. Though his hair is on the long side, it’s actually not the dark wig Loki wears in the “Thor” and “Avengers” movies. It’s just Hiddleston’s natural red locks, which was the first clue that this isn’t the streaming project fans are anxious to see.

“Betrayal” is a Harold Pinter play that Hiddleston will star in, the Guardian reports. Thursday marked the 40th anniversary of the play’s first performance at the National Theatre, so it was only fitting that the Jamie Lloyd Company announced the play’s newest revival on that day.

Hiddleston, a British theater veteran, will star in “Betrayal” for just 12 weeks starting March 5 at the Harold Pinter Theatre in London. A pre-sale begins Thursday, Nov. 29 for previous Jamie Lloyd Company ticketholders, Ambassador Theatre Group Theatre Card members and Pinter at the Pinter ticketholders. The general sale starts Friday, Nov. 30 via ATG Tickets.

The theater company has been producing an entire season of Pinter’s plays, calling the programming stunt Pinter at the Pinter. “Betrayal” is one of the playwright’s most beloved scripts, following two married couples and an extended affair.

Tom Hiddleston
Tom Hiddleston's mysterious Twitter video was actually for a play, not the Loki TV show. He is pictured at the "Avengers: Infinity War" premiere on April 23, 2018 in Hollywood, California. Rich Polk/Getty Images for Disney

“‘Betrayal’ is a masterpiece. Jamie Lloyd’s Pinter at the Pinter season is terrific and I am so pleased that he’s asked me to be part of it,” Hiddleston said.

Hiddleston is the latest Marvel actor to hit the stage, which is where he launched his career. Martin Freeman, who plays Everett K. Ross, will be in Pinter at the Pinter just before Hiddleston’s run starts. Captain America actor Chris Evans made his Broadway debut in “Lobby Hero” earlier this year. Mark Ruffalo, Scarlett Johansson and Danai Gurira have all left their mark on Broadway while Tom Holland, Benedict Cumberbatch and Hayley Atwell have been seen on the West End.

There’s still no word about when fans will see the Loki TV series. Though Hiddleston seemingly tweeted a confirmation that he will star in the Disney+ show earlier this month, the streaming service hasn’t announced when it will go live.