2. Best Frenemies

Three fitness fanatics put their pecs through their paces in a lava-filled kid's room. Also competing: three smoldering actors and a trio of wrestlers.

3. Putting the Lava in Check

chess-loving trio, a team of swing-dancing hipsters and three aspiring Marine Corps officers compete for sweet victory in a garage most slippery.

4. Cruisers, Bakers and Bubble Makers

A creepy attic threatens to swallow up this episode's three lava-traversing teams. Can the Cruise Crew, Team Bakers and the Mermaids handle the heat?

5. Child's Play

A team of improv teachers, a trio of best friends, and three roommates put their skills to the test in the hope of scoring the $10,000 prize.