The first set photo for the Han Solo 'Star Wars' spin-off reveals the movie's brilliant secret code name

Lucasfilm

The INSIDER Summary

The Han Solo "Star Wars" movie started production.
Co-director Chris Miller shared a photo from the set of a clap card for the movie.
Eagle-eyed fans will notice the working title for the movie is "Star Wars: Red Cup."

The Han Solo "Star Wars" spin-off is officially underway and to kick off production, co-director Chris Miller shared a photo on Twitter showing a clap card for the film. 

While Miller's tweet humorously references the infamous "Han Shot First" debate between fans, what you should really be paying attention to is the working title for the film at the bottom of the clap card. 

It reads "Star Wars: Red Cup."

As in red "solo" cup. 

It's common for movies to film under secret production titles. The "Star Wars" films have been shrouded in secrecy with alternate working titles. "Episode VII" was reportedly known as Foodles, a brand of healthy Disney snacks.

Carrie Fisher revealed in a February 2016 tweet that "Space Bear" was the working title for this year's upcoming "Star Wars: Episode VIII."

"Red Cup" is pretty brilliant and we expect the Han Solo spin-off movie to be quirky and chock-full of references to the vast "Star Wars" universe with the comedy duo of Miller and Phil Lord ("The LEGO Movie," "21 Jump Street") on board directing.

Alden Ehrenreich will star as Solo while Donald Glover ("Atlanta") will play a young Lando Calrissian. Emilia Clarke ("Game of Thrones") is also set to star. 

The yet untitled movie is set for release in 2018.