Jon Favreau/Instagram

That's quite a birthday surprise: "Star Wars" creator George Lucas stopped by the set of "The Mandalorian" to wish show runner Jon Favreau a happy birthday. (The "Iron Man" director turns 52 today.)

Especially since we don't recall seeing Lucas stopping by other recent "Star Wars" productions to say hello.

Favreau shared the photo on Instagram, which prompted fans to speculate that Lucas might be directing an episode of the upcoming series.

Just yesterday, Favreau shared a group pic of the talent behind the upcoming "Lion King" remake. Hey, he's almost as busy as Matthew Broderick!

Lucasfilm previously announced that although Favreau is creating and writing the "Star Wars" spin-off, the show will have numerous directors, including Taika Waititi, Bryce Dallas Howard (the Force is strong in her family), Dave Filoni, Deborah Chow, and Rick Famuyiwa.

At this point, we don't know any cast members. And since the only photos we've seen have been of props and a helmeted character, the mystery remains.

Here's the official synopsis: "After the stories of Jango and Boba Fett, another warrior emerges in the 'Star Wars' universe. The Mandalorian is set after the fall of the Empire and before the emergence of the First Order. We follow the travails of a lone gunfighter in the outer reaches of the galaxy far from the authority of the New Republic."

The show is set to premiere on Disney's upcoming streaming service sometime in late 2019.

[Via Collider]