The Speedster Supe You Forgot About In Amazon's The Boys

In the fifth episode of season 2, entitled "We Gotta Go Now," new Senior Vice President of Hero Management Ashley Barrett mentions to A-Train that he served four more years than Mister Marathon. However, eagle-eyed viewers will have caught Mister Marathon depicted two episodes earlier, when Dawn of the Seven director Adam Bourke presents some of the film's storyboards. In the pitch meeting for the blockbuster Seven movie, Mister Marathon is shown as an original member of the Vought International team, alongside Lamplighter, Homelander, Queen Maeve, the Deep, Black Noir, and Translucent. 

Appearing in a red-and-gold costume and wearing a mask resembling Wolverine's, Mister Marathon as a founding member of the Seven is aligned with the comic book's version of the character. Though little is known about his backstory, Mister Marathon is first mentioned in The Boys #19, titled "I Tell You No Lie, G.I., Part One." In that issue, the Legend, an elderly former comic writer and editor who knows everything about Supes, tells Hughie that Mister Marathon was the seventh member of the Seven to be created by Compound V. From there, Mister Marathon appears in a few of the comic book's 72 issues, and is relegated to flashbacks as the Legend shares the origin of the Seven.