The Challenge: Spies, Lies & Allies
| Spies, Lies & Allies | |
|---|---|
| Season 37 | |
| Presented by | T. J. Lavin |
| No. of contestants | 36 |
| Winners |
|
| Location | Vrsar, Croatia |
| No. of episodes | 20 (including the Reunion special) |
| Release | |
| Original network | MTV |
| Original release | August 11 – December 22, 2021 |
| Season chronology | |
The Challenge: Spies, Lies & Allies is the thirty-seventh season of the MTV reality competition series The Challenge. This season features alumni from The Real World, Are You the One?, Big Brother (Nigeria, UK and U.S.), Ex on the Beach (Netherlands), Survivor (Romania, Spain, Turkey and U.S.), Love Island (Germany, UK and U.S.), Geordie Shore, Warsaw Shore, Paradise Hotel (Sweden), Shipwrecked, The Circle (U.S.), Too Hot to Handle, Ultimate Beastmaster and 12 Dates of Christmas competing for a share at a $1 million prize. The season premiered on August 11, 2021. A launch special titled "The Challenge Spies, Lies and Allies: Global Activation" aired on August 9, 2021. The season aired in 190 different countries, and was the number one unscripted series, for 18-34 year olds, in the 2021–2022 broadcast year.
This season's 12th episode, titled "500", marked the series' 500th episode overall and aired on October 27. This milestone was commemorated by host T. J. Lavin and the remaining cast prior to commencing the episode's challenge.