It's been several years since ABC aired a season of "The Mole" (10 tonight, WTAE), a reality competition with a devoted following.

New host Jon Kelley replaces past hosts, including a pre-CNN Anderson Cooper, and welcomes 12 Americans at the edge of a South American waterfall for their first physical challenge. The game play remains the same: One of the 12 is "the mole," the individual who's being paid to sabotage their missions.

In the first challenge, it's particularly difficult to tell who might be the mole and who is just unlucky or uncoordinated enough not to grab a bag of money while riding a raft over a waterfall. A second challenge involves scavenging for items on a beach. Naturally, every action or inaction creates suspicion.

"I noticed the girls were doing most of the running and the guys were just sauntering," says Liz, a 60-year-old retiree.

Fans of mysteries, competitions and character-driven reality shows will be thrilled to see "The Mole" surface.