After 9 days on the road, the remaining teams test their challenge skills in the desert southwest for the Season 5 championship.

An audible memory challenge stumps the teams. Demetrius meets a key paternal relative. Marcus and his dad share a heartwarming discovery. A trip to Day 10 is on the line for two teams with two strikes!

Team Green gets off to a rough start when Marcus's dad shows up late to pick them up. While they set off toward Vegas, Team Red heads toward a relative that will help Elizabeth understand more about her maternal side.

The teams' art skills are on display in a challenge. Elizabeth's emotions are tested with a close relative. The twins continue their journey and meet a key relative in the search for their dad. Marcus connects with his dad's side.

Immunity is on the line. A hamster-like challenge has the teams rolling in all directions. Chonta's surprised by an emotional cousin. Team Red plays hockey, Team Green camps and learns to wakeboard, and Team Black learns baseball.

The teams show off their singing abilities. Strange paper airplanes are made to pop through a challenge. Marcus meets the person who linked him to his father. Elizabeth discovers her dad's side of the family. Team Black finds out twins run in their family.

The brothers from L.A. get a geography lesson and throw pottery for the first time. All teams carefully balance their way through a challenge. Demetrius discovers another relative on his dad's side, and Maria attends a very special surprise birthday party.

All the teams must "smell" their way to victory competing in a blind folded challenge. A door opens, and Maria's life is changed forever. Kaley and Kristin connect with their family at a recording studio. Marcus meets his mom's brother for the first time.

Teams Red and Blue battle heavy rain and compete head to head in a building block challenge. Kaley and Kristin go back to driving school with a relative. Demetrius falls to his knees after meeting the first blood relative on his fathers side. Keith connects with his father's side of the family.

Four new teams take off from St. Louis with a stunning twist at the starting line. Chonta discovers her southern slavery roots. Maria sees a shocking family tree. Marcus learns Arkansas is a state, and takes part in a family dance-off. The twin sisters start a texting war they can't finish.