The Challenge: USA

The 18 reality titans from "Big Brother," "Survivor," and "The Amazing Race" are shocked to learn that they are competing against six veterans from MTV's "The Challenge"; a new twist puts multiple players at risk at the first elimination.

The challengers battle it out in a difficult water challenge; a new alliance is formed to target a veteran; romance blossoms between two teammates.

The challengers compete in a difficult swimming challenge, and the CBS reality titans officially declare war against the veterans prompting a vet to turn on one of their own in an act of self-preservation.

Host TJ Lavin reveals a shocking double elimination leaving the Challengers scrambling to win a high-stakes, adrenaline filled semi-truck challenge to ensure their survival in the game.

The CHALLENGE vets come up with a plan to take advantage of a growing rift among the rookies, resulting in one of the most shocking hopper results of the season.

Things get heated between two rookie players, and the competitors brace themselves for host TJ Lavin's favorite challenge of the season, trivia.

A pair of "Challenge" vets play cupid as romance blossoms for a couple of former "Big Brother" houseguests; TJ makes a shocking announcement that impacts the game for the remainder of the season.

The challengers' strategies shift after host TJ Lavin announces that the team competition has concluded and they enter the individual phase of the game.

As the individual game heats up, CHALLENGE vet Tori tries to cool things down with her showmance, and Michaela sets her sights on a fellow SURVIVOR player who could be a threat to her game.

Alliances are tested after host TJ announces another double elimination. Meanwhile, as the connection between Alyssa S. and Tyler grows, so does the target on their backs.

Challengers must navigate a slippery situation when they battle it out in a physical wrestling match.

Tables are turned and alliances scramble to navigate a new power dynamic after an intense challenge in the Croatian ruins

One competitor must face their greatest fear in a terrifying challenge, and a double elimination forces allies to turn on each other, leading to a shocking betrayal.

The final eight competitors battle it out in a grueling two-day final challenge where only one man and one woman will have the chance to be crowned champions and split the $500,000 grand prize.