Slater stars in the show about amateur detectives who investigate the deaths of John and Jane Doe victims. He said ABC has signed off on a few more episodes despite the show's lackluster ratings.
One of the changes is new cast member Elisha Cuthbert, whose film credits include "The Girl Next Door." Slater says Cuthbert brings a new energy to the set.
The actor's comments came Thursday during a taping of "Extreme Makeover: Home Edition." Slater is helping volunteers renovate the home of Sherman and Gina Heathcock of Hattiesburg, Miss. The episode will air in 2010.