Fisher and Marshall will remain on the judging panel

FOX officially announced the permanent judges and host for the summer reality show "On the Lot," but will anybody be tuning in to see them?

Actress-author Carrie Fisher and director-actor Garry Marshall will judge the first season of the Mark Burnett/Steven Spielberg-produced show, which got off to a dismal start in its first two airings. Fisher and Marshall were already judges for those first episodes along with guests Jon Avnet and Brett Ratner.

Additional guest judges will appear on a weekly basis, starting with D.J. Caruso, whose "Disturbia" was one of the surprise hits of the spring. Caruso will appear in the show's first "Film Premiere" episode, airing Monday (May 28), as well as the first "Box Office" results show the following night.

Veteran entertainment news anchor Adrianna Costa will host the show, rather than Chelsea Handler, who hosted last week's Top 50 episodes.

"On the Lot" premiered on Tuesday night after an "American Idol" episode that averaged 25.24 million viewers and saw that audience dwindle to an average of 8.54 million, including an average of 6.2 million for its second half-hour. Airing Thursday after the premiere of "So You Think You Can Dance," "On the Lot" was only able to attract 5.18 million viewers, losing nearly half of its adults 18-49 lead-in.

The show's eventual winner receives a $1 million DreamWorks development deal.