It looks like Mindy Kaling and Reese Witherspoon loved working with each other so much on Ava DuVernay’s upcoming film adaptation of A Wrinkle in Time that they decided to take their working relationship to TV. The Big Little Lies star is set to guest star on the final season of Hulu’s The Mindy Project alongside Kaling.

Emmy-nominated Kaling took to Instagram to make the announcement, posting a photo of Witherspoon and her shooting a scene for the show:

Witherspoon also posted her involvement in the show (and this mysterious cave scene) on Instagram with a photo of the script and a caption :

Is it possible to have too much fun on set? Exciting cave-dwelling things to come with @mindykaling and #TheMindyProject! ✨

A post shared by Reese Witherspoon (@reesewitherspoon) on

Details about Witherspoon’s character are being kept under wraps. Kaling’s show has seen an impressive roster of guest stars including Witherspoon’s Big Little Lies co-star Laura Dern, Laverne Cox, Shonda Rhimes, Seth Rogen, James Franco, Joseph Gordon-Levitt, Frieda Pinto, Stephen Colbert and Greta Gerwig.

The final season of The Mindy Project premieres September 12 on Hulu.