Mr. Irrelevant Cast: Who Plays Who, and Who Was Real

Mr. Irrelevant is a biopic, so the first useful question about its cast is not who is in it but which of them are playing people who existed. The answer is most of them: of the five roles with a published character name, four are real and one was written for the film. Here is the full list, who the real people were, and the one the screenwriters made up.

Who is in the Mr. Irrelevant cast?

Nine actors are named so far. Five have a character attached; the other four are confirmed in the cast without a published role.

Corenswet was in talks for the lead in October 2024, Isabel May in March 2025, and Michael Shannon joined as Parcells in April 2025 — the same month the shoot began. David Krumholtz was added that June.

Who was the real John Tuggle?

A running back from Honolulu by way of San Jose who was taken with the 335th and final pick of the 1983 NFL draft, which is what makes someone Mr. Irrelevant.

He was not a curiosity who got cut. Tuggle made the roster through special teams, and when Rob Carpenter was injured in week 12 he started at fullback. He finished his rookie season with 17 carries for 49 yards and a touchdown, three catches for 50 yards and nine kickoff returns for 156 — and his team-mates voted him special teams player of the year.

The following offseason he divorced, hurt a knee, and was in a car that hit a telephone pole. The shoulder pain afterwards seemed out of proportion to a minor collision. Carpenter, who was in the same car, told him to see a doctor; the diagnosis was cancer. He kept training with the team through chemotherapy. The Giants told him not to report to camp in 1985 so that they would not have to cut him and he could draw his salary to the end of his contract, paid his health insurance for the rest of his life, and wore his number 38 on their helmets through the 1986 season — the one that ended in a Super Bowl. He had died days before it began.

Which characters are real people?

Four of the five. Two are famous, one is well known to Giants supporters, and one is not known outside the building.

Bill Parcells, played by Michael Shannon, was in his first year as Giants head coach in 1983, inheriting a team that had managed one winning season in the previous ten. He went on to coach the Giants until 1990 and win two Super Bowls, and is the coach American football fans know as the Big Tuna — a nickname the film’s period predates the peak of.

Leonard Marshall, played by Tuwaine Barrett, was a defensive end who finished with 79.5 sacks for the Giants, third in the franchise’s history, two Pro Bowls and two championships.

Julius “Whitey” Horai, played by David Krumholtz, is the one you will not find in a record book. ⚠️ The only account we could find of what he did — that he had been with the Giants since 1954 and ran the day-to-day details of their training complex — comes from a long-running Giants history blog rather than from the club or a news organisation, so treat it as the best available rather than as confirmed. It does explain the casting: a film about the last man on the roster needs someone who has watched thirty years of them arrive.

Which character did the film invent?

Isabel May’s Katie, and the film is explicit that she is not a portrayal of Tuggle’s real ex-wife, Stephanie.

That is a deliberate choice rather than an oversight, and it is worth knowing before you watch the trailer, which sells the relationship hard — Paramount’s own synopsis describes Tuggle defying expectations for his coach, “his newfound love” and his team. What the record actually says is that he and his wife divorced in the 1984 offseason, in the same months as the knee injury and the crash that led to the diagnosis.

So the film has not dramatised that marriage. It has written a different relationship and placed it where that one was. Biopics do this constantly and it is not a scandal; it is simply a thing to know, because the emotional centre of the trailer is the part that did not happen.

Why cast Leonard Marshall in a film about the last pick?

Because Marshall and Tuggle came out of the same draft, at opposite ends of it, and what happened to each of them afterwards is the whole point.

298 picks separated them on one afternoon in 1983. Marshall played ten seasons for the Giants and won two championships. Tuggle played one and was gone. Putting both men in the same film is not set dressing — it is the cheapest possible way to show what “irrelevant” was supposed to mean and what it turned out to mean, and the 1986 season makes the point again: Marshall won his first ring in the year the team played with Tuggle’s number on their helmets.

Who directed it and who else is behind it?

Jonathan Levine directs, from a screenplay by Nick Santora, who also produces.

The producers are David Ellison, Dana Goldberg, Don Granger, Levine, Gillian Bohrer and Santora, for Skydance Sports, Megamix and Blackjack Films, with Paramount distributing. Tuggle has been filmed before, incidentally: he is the subject of a 30 for 30 short called The Irrelevant Giant.

When does Mr. Irrelevant come out?

25 December 2026, in cinemas, from Paramount. It runs 125 minutes and has already been classified 12A in Ireland, months ahead of release.

One piece of trivia that explains a lot of confused searching: the film was announced in April 2026 under the title Mr. Irrelevant: The John Tuggle Story, and shortened to Mr. Irrelevant only when the trailer arrived in September. If you have been looking for this under the man’s name rather than the film’s, you were using the official title until five months ago. We went through where to find that trailer — there are three official uploads of it and two of them have identical names.

The bottom line

Nine actors, five published roles, four real people and one invented one. Corenswet plays the last pick of a draft, Shannon plays the coach who kept him, Barrett plays the man taken 298 places ahead of him, and Krumholtz plays someone who had been around the Giants for thirty years before either of them arrived. The one to keep straight is Isabel May’s Katie, who is not the wife Tuggle actually had. And if Corenswet looks unfamiliar, that is the point — the last time most people saw him he was playing Superman, which we wrote about in the Supergirl review .