The actress who played Donna on Fox’s "That ‘70s Show" will be appearing on ABC’s "Castle," reports TV Guide.

Laura Prepon will star in the movie within the TV show, playing actress Natalie Gray, who’s cast as Nikki Heat–the fictional character from Castle’s novels.

Nikki is based on Kate (Stana Katic), Castle’s real-life cop connection. Prepon will make her first guest appearance in the Jan. 3 episode.