Tina Barta
The Road Rules: South Pacific vet went on to become one of the franchise's most iconic female competitors, making it to two finals but never bringing home a win.
In the 15 years since her memorable last appearance in The Duel, in which she was disqualified for punching Beth Stolarczyk, Tina's life is, in her words in the season premiere, "fabulous. I have a husband, no kids. I don't work. I have a pool in the backyard. Life is really good."
Janelle Casanave
The Real World: Key West alum only competed in two Challenge seasons, but won The Inferno 3.
After last appearing in 2008, the 39-year-old went on to become a surgical nurse and is married with two children.
Derek Chavez
After The Real World: Cancun, Derek competed on three seasons, last appearing in 2013 on Rivals II. The 33-year-old now resides in Arizona.
Nehemiah Clark
During The Real World: Austin vet's time on The Challenge, he won one of the four seasons he competed on before making his final appearance on 2011's Rivals. After being eliminated just before the final in the inaugural season of All Stars, he is back for another shot at the title.
But in his decade away, the 36-year-old still had ties to the franchise, remaining close friends with Wes Bergmann. The two created their own digital show, Friends With Benefits, during quarantine, which featured appearances from other alumni.
While he was once Beth Stolarcyzk's "Tenderoni," Nehemiah struck up a showmance with Jemmye Carroll during All Stars' first season.
Melinda Collins
After making her debut on The Real World: Austin, Melinda went on to compete in four seasons of The Challenge, competing alongside and then against her Texas housemate-turned-husband Danny Jamieson before their divorce in 2010.
The 38-year-old married Matt Collins in 2016 and the couple have a 2-year-old son, Camden. Melinda is the co-host of the Blonde Moments podcast.
Casey Cooper
While the Fresh Meat alum was an alternate for season one, Casey is now hoping for her first-ever Challenge win.
Since competing on The Ruins in 2009, the 34-year-old now works as an accountant and is engaged to her longtime boyfriend.
Katie Cooley
New last name, same Katie!
The Road Rules: The Quest star was a staple of the franchise back when she was Katie Doyle, competing on nine seasons and notching one win.
After last appearing on 2010's Cutthroat, Katie, 44, settled down in Lexington, Ky., and welcomed a now 6-year-old daughter with her husband before returning for All-Stars season one. In addition to working as a finance manager, Katie also runs her own lifestyle blog.
Tyler Duckworth
After a decade away from the franchise, the two-time champion from The Real World: Key West is back for a shot at another title. And Tyler, who is now a teacher in North Dakota and getting his doctorate, revealed to Entertainment Weekly that he didn't leave the franchise by choice.
"I thought they lost my number because I won two Challenges in a row and then never heard from them again," the 40-year-old admitted. "It felt like I was being punished for doing so well."
While Tyler has no ill will toward the producers, he went on to add, "There's a lot of shoulda-coulda-wouldas. I feel like I missed out, but I had to grow up at some point, and I am just so, so appreciative to be able to get back in gear and participate again. But yeah, I probably would have won a couple more, easily. Easily!"
Brad Fiorenza
Since his debut on The Real World: San Diego in 2004, Brad has been one of the show's most dominant male competitors, winning one season and making it to three additional finals. Brad last competed on the OG show in 2018.
The 40-year-old has two sons with his ex-wife Tori Gwynn, whom he met on The Gauntlet III. After their divorce in 2016, Brad entered a brief romance with Britni Thornton, a former Challenger.
MJ Garrett
MJ first appeared on The Real World: Philadelphia before going on to compete on three seasons of the spinoff, winning The Gauntlet II in 2005 and last appearing in 2009.
The 41-year-old is married to Amanda Weaver (who starred as Mary Anne on The Real Gilligan's Island 2) and the couple have two daughters: Bella, 14, and Liv, 11.
Leah Gillingwater
The Real World: Paris alum went on to compete on just one season of The Challenge, 2004's The Inferno, before going on to move to Los Angeles and becoming a mom. The 41-year-old's Insta bio states she works as a producer and stage manager.
Cohutta Grindstaff
Cohutta competed on four seasons, last appearing in 2015, after making his debut on The Real World: Sydney.
The 38-year-old now owns his own construction company in Montana. He lives with his longtime girlfriend in a cabin on a sheep farm.
Teck Holmes
The Real World: Hawaii's breakout star went on to compete in just one outing, Challenge 2000, in, you guessed it, 2000.
Two decades later, many fans were surprised to see that All Stars secured Teck, 45, on its roster, and he didn't disappoint, becoming the comic relief of the season despite an early elimination.
Following his reality TV days, Teck went on to become an actor, producer and DJ.
Ryan Kehoe
After making his debut on Fresh Meat in 2006, Ryan competed in five additional seasons, making it to the final of The Island. He is back in action after more than 11 years away.
The 40-year-old currently resides in NYC, but has plans to move to Austin.
Derrick Kosinski
The Road Rules: X-Treme alum went on to become one of the fiercest competitors in Challenge history and is a three-time winner, though he failed to make it to the finals of All Stars last season.
The 38-year-old is engaged to longtime girlfriend Nicole Gruman and hosts the popular Challenge Mania podcast.
Ayanna Mackins
The Road Rules: Semester at Sea alum last appeared in 2005 on Battle of the Sexes II and is actually the first-ever Challenger to be disqualified from the competition for an off-camera physical altercation.
Ayanna, 41, is married and has four kids, two teenagers and two toddlers.
Jonna Mannion
Hailing from The Real World: Cancun, Jonna appeared on five seasons of The Challenge, the last one being Battle of the Exes 2 in 2015.
The 33-year-old now has two children, daughter Naleigh, 5, and son Cal, 22 months, with her husband, Kevin. Jonna left to film All Stars just three months after welcoming her second child, making it to the finals.
Steve Meinke
After making his TV debut on Road Rules: The Quest, Steve went on to compete on The Gauntlet in 2003. He now works as a hand model.
Sophia Pasquis
Following her run on Road Rules: The Quest, where she made history as the first gay cast member on the show, Sophia made it to the finals of the only Challenge season she competed on in 2002.
Sophia now lives in New Jersey and was an alternate for season one of All Stars.
Jasmine Reynaud
After making her debut on The Real World: Cancun, Jasmin went on to compete on five seasons, last appearing in 2014.
The 34-year-old is now living in Massachusetts and is married with two children.
Kendal Sheppard
The Road Rules: Campus Crawl alum won the only season of The Challenge she appeared on: 2004's The Inferno.
Since then, the 42-year-old got married, became a mom of three, began a career as a nurse and got super into yoga, which helped her to become a major threat during the first season of All Stars.
Darrell Taylor
The Road Rules: Campus Crawl star is one of the show's most dominant competitors with four wins and he appeared on the most recent season of the OG show and made it to the final of season one of All Stars.
When he's not competing, Darrell, 42, is a personal trainer and runs his own boxing gym, LB4LB Fitness, in Los Angeles. He married his longtime girlfriend Milasent Hernandez in 2017 and they have two children.
Laterrian Wallace
After his time on Road Rules: Maximum Velocity Tour, Laterrian competed on three Challenges, last appearing in 2003 on The Gauntlet.
Eighteen years later, the 44-year-old is committed to the fitness and lifestyle spaces, posting his workouts on Instagram and is back for another chance at winning a Challenge after being eliminated in season one of All Stars.
Jodi Weatherton
After winning The Duel in 2007, the Road Rules: X-Treme vet and two-time champ didn't return to the franchise, telling Entertainment Weekly she was never invited back. But that was OK with Jodi.
"I really thought 15 years ago that I was done doing the show," she explained. "I really wanted to start a family and use my college degree and move on with my life. I was ready to stop doing the shows and never thought I would do one again."
Jodi, 40, is now married with two children living in Minneapolis and working at an army wellness center.