Derrick Kosinski

Twenty-two Challenge All Stars return for a second chance at the ultimate competition and a $500,000 grand prize. Right out the gate, the competition gets real with an intense underwater challenge. An honest player struggles with the game's politics.

All eyes are on the notorious Wes and Veronica as they make their first appearances on "All Stars" and leave both their enemies and friends wondering what trouble they have in store for this season.

An added twist in the game, the sabotage, is in play and the All Stars nervously wonder which players will fall victim to it. The high flying "Out Of Reach'' challenge leaves some players all wet and others breaking down.

Twenty-four Challenge All-Stars are reunited in Cancun to face their past and pursue a $500,000 grand prize. An old rivalry flares up between two power players. TJ shocks everyone with an unexpected twist.

The gloves (and clothes) are off at the muddy "Playing Dirty" challenge as the All Stars wrestle to control who gets voted into the Arena. The newly formed Treehouse alliance makes major moves to crush players who stand in their way.