Nathan Fillion has hyped up Firefly fans with a number of social media posts that has some hoping for a series return over 20 years after it was canceled.

Fillion, who plays Captain Mal Reynolds in Firefly, has made several social media posts where he visits various cast members from the show while highlighting a mysterious “announcement.” He’s made videos with folks like Morena Baccarin, Gina Torres, Summer Glau, and Sean Maher, and in the clips, he tells his former costars that “it’s time.”

It seems as though Fillion is hinting at some kind of cast reunion, but in what form will that reunion take? That’s anyone’s guess right now. In the post where Fillion joins forces with Maher, the caption tells fans: “Some of you have guessed convention, podcast, or cross-over. You are wrong.” And that means some folks who assumed Fillion and his other former Firefly costar Alan Tudyck would be hosting a reunion (and maybe even a rewatch, too) on their podcast Once We Were Spacemen are probably ultimately incorrect.

When is this big announcement happening, you might be wondering? Well, in Fillion’s latest post — all of which have been made on his podcast account, fueling that speculation — he visits costar Jewel Staite and confirms that the surprise will be revealed on Sunday, March 15, though he doesn't clarify where or how the announcement will be made.

As far as what the announcement could actually be, fans have been musing about a potential 25th anniversary reunion special, one bigger than a podcast meetup, or even the highly anticipated and hoped-for revival series fans have waited patiently for.

"I swear by my pretty floral bonnet, if Nathan Fillion is leading us on with these hints I will curse his sudden but inevitable betrayal," said one fan on the Firefly subreddit, which as you can imagine is all sorts of busy right now.

That said, Baccarin, who played Inara Serra, previously opened up about how unlikely it was for a full-scale revival to happen. "There’s always talk. There’s always people asking about it. Part of me would be excited to revisit that world, and part of me is also a little bit like, I love it so much where it is, that I’m worried about reopening that door,” she explained on Inside of You with Michael Rosenbaum back in July 2025. “That’s a lot of different careers and different people that you have to negotiate with and make work and all that … schedules and whatnot. Could there be a comic book or [another] thing–maybe?"

Firefly premiered on Fox in September 2002 and ran for just 11 of its 14 episodes before being cancelled. The series, created by Joss Whedon, followed the crew of the spaceship known as Serenity helmed by Fillion’s Mal Reynolds in the year 2517 and ended up becoming a cult classic once it made its way to DVD. We’ll see where this new announcement takes things for the fans.

Lex Briscuso is a film and television critic and a freelance entertainment writer for IGN. You can follow her on Twitter at @nikonamerica.