FX’s comedy series Adults will unveil a stand‑alone prequel titled “Marathon Day” on July 31, 2026, before its second season arrives later this year. the episode, streaming on both FXX and Hulu, revisits the early days of the five twenty‑somethings and explains how the core group formed in New York City.

July 31 Release Locks in Fans Before Season 2 Premiere

According to the network’s announcement, “Marathon Day” drops at 1 PM ET/10 AM PT on Friday, July 31 , 2026, giving viewers a fresh entry point ahead of Season 2, which is slated for later in 2026. The timing mirrors a strategy used by other FX comedies, where a special episode builds momentum and retains audience interest between seasons.

Tribeca Festival Screening Sparks Early Buzz

The episode premiered at a surprise screening during the Tribeca Festival earlier this week, where showrunners Ben Kronengold and Rebecca Shaw praised the chance to “share the origin story of the friend group with the fans.” As reported by the festival’s press release, the screening generated a lively Q&A, with cast members Malik Elassal, Lucy Freyer, Jack Innanen, Amita Rao, and Owen Thiele fielding questions about the characters’ backstories.

Paul Baker’s Backstory Takes Center Stage

“Marathon Day” focuses on the origins of Paul Baker, played by Malik Elassal, tracing his path from a solitary runner to the catalyst that brings the group together. The writers intend the episode to deepen viewers’ understanding of Paul’s motivations, a move that could enrich the relational dynamics expected in Season 2.

Special Guest Appearances Add Star Power

In addition to the core cast, the prequel features cameo roles from Charlie Cox as “Mr. Teacher” and Rachel Marsh as “Carly,” offering a nod to longtime fans and potentially attracting new viewers famliar with Cox’s Marvel work. The inclusion of these guest spots was highlighted in the FX press kit, which called them “surprise treats” for the audience.

What Remains Unclear About the Prequel’s Narrative Scope?

While the network confirmed the episode’s release date and guest lineup, it has not disclosed how much of the broader series mythology will be addressed. Specifically , it is unknown whether “Marathon Day” will resolve any lingering questions from Season 1, such as the mystery surrounding the group’s first marathon event, or if it will simply set up new plot threads for Season 2.

According to FX’s official statement, the episode is intended as a “standalone orrigin story,” but the exact length and whether it will be counted toward the season’s episode total remain unverified. Fans will also be watching to see if the prequel’s tone aligns with the acclaimed humor that earned Season 1 critical praise.