Episode four featured the girls receiving lessons on commercial and high-fashion posing. Their challenge was to model for a Sears catalogue, using the four seasons as their back-drop. This week's photoshoot involved the contestants posing as their dream careers.

While on vacation, Angela's boyfriend goes missing . When a skull shows up, she asks Brennan for help in identification, concerned it might be her boyfriend or the female guide who went missing with him. The investigation leads the team to a violent boyfriend, the local sheriff and ultimately to a counterfeiting ring setup in the desert.

Reid finds himself in danger when he falls for a starlet whose stalker has turned into a killer.

Stan is the driving force who gets the citizens of South Park to all buy hybrid cars. Just as everyone starts to feel really good about what they’re doing to help save the earth, a stormy dark mass has started accumulating over the town.

Stephen Colbert welcomes the author of "Impostor: How George W. Bush Bankrupted America and Betrayed the Reagan Legacy", Bruce Bartlett!

Guests: John Goodman, Angela Nissell, Alkaline Trio

For the quickfire challenge the contestants are brought to a convenience store to buy ingredients for their dish. For the elimination round the contestants must create a delicious entree that can be reheated in a microwave for women at a local Junior League.