- Primary Subject: The Boys Season 5 Jared Padalecki as Mister Marathon
- Key Update: Jared Padalecki is confirmed to play Mister Marathon, a speedster and former member of The Seven, appearing in Episode 5.
- Status: Confirmed
- Last Verified: April 22, 2026
- Quick Answer: Jared Padalecki plays Mister Marathon, a speedster and original Seven member. He debuts in Episode 5 as a potential, albeit morally bankrupt, replacement for A-Train.
Jared Padalecki’s appearance in The Boys Season 5, Episode 5 has finally been confirmed, and fans already know the role he will play, and it's definitely a major one.
Padalecki, alongside Misha Collins and Jensen Ackles, is set to guest star in the final season of the hit Prime Video series, marking a Supernatural reunion with showrunner Eric Kripke.
Now that Padalecki’s character has been revealed, here’s what fans can expect.
What Role Jared Padalecki Will Play in The Boys Season 5?
During an appearance at the FACTS Convention in Belgium (via TikTok), Jared Padalecki confirmed his role as Mister Marathon in The Boys Season 5.
In the comics, his character is a Supe who has been mentioned in the series several times before and has even appeared in flashbacks.
Mister Marathon is a former member of The Seven, although his time with the team was short-lived.
Ability-wise, he is known for his super speed and was once dubbed the “fastest man” before being replaced by A-Train.
So, with A-Train seemingly dying in The Boys Season 5 premiere, it is highly likely that Vought will look for Mister Marathon as a replacement.
In fact, the final season’s trailer shows Soldier Boy and Homelander seemingly wanting something from Mister Marathon, and the upcoming episodes may finally reveal what it is.
What is the Fate of Jared Padalecki’s Mister Marathon in The Boys Season 5?
In the comics, A-Train replaces Mister Marathon after the latter dies during a mission with Homelander.
Now that he’s appearing in The Boys Season 5, there’s a strong chance Prime Video will take some creative liberties with his storyline.
But Eric Kripke confirmed to Entertainment Weekly that Jared Padalecki and Misha Collins will play “douchebags” and “not morally upstanding dudes” in the final season.
From the looks of it, they may portray villainous Supes who could go up against the Boys. It’s possible that Mister Marathon could rejoin The Seven or carry out a mission for them, with Homelander potentially having him killed during that mission.
However, the show does not strictly follow its source material, the comic book series by Garth Ennis and Darick Robertson.
Whatever the case, fans will have to wait and see how things unfold.
The Boys Season 5, Episode 5 is set to be released on Wednesday, April 29, on Prime Video.
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