As of August 2026, Mars Callahan is best known for The Wonder Years and I Know My First Name Is Steven. Find every show and movie Mars Callahan has starred in — and where to watch them — below.
Mars Callahan

Mars Callahan

Actor Studio City, California, U.S. 2 TV Shows 6 Movies

​From Wikipedia, the free encyclopedia.

Mars Callahan (born 1971) is an American actor, director, producer and writer.

He is known, among other things, for the movie Poolhall Junkies where he served as director, actor and screenwriter.

At the age of eleven Callahan toured with a children's musical group through thirty-seven states. At fifteen he received his first acting role in the television series The Wonder Years. After honing his acting skills in television he tried for the big screen and soon appeared in various films. Inspired by the directors he worked with Callahan decided to try working behind the camera and in 1998 shot his first short film The Red Bag.

In a 2007 Hollywood Reporter interview he revealed that he has had serious health problems when doctors found a tumor in his right kidney. He lost his right kidney, his right adrenal gland and has been in and out of a wheelchair for years.

Description above from the Wikipedia article Mars Callahan, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Mars Callahan has built a filmography of 8 credits over a career spanning from 1986 to 2002.

Mars Callahan's most notable role to date came in The Wonder Years (1988), where they played Steve. They also appeared in That Thing You Do! (1996) as Ernie the Disc Master Engineer. Most recently appeared in Kalifornia (1993) as Walter Livesy.

Fans wanting to catch up on Mars Callahan's work can find exactly where their shows and movies are streaming below — and TV Butler Pro makes it effortless to keep track of them all. Just search the title, and Butler finds it instantly, tells you which service has it, and remembers what you've already watched.

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📺 Mars Callahan's TV Shows

The Wonder Years
Steve
1988
I Know My First Name Is Steven
Victor (Age 14)
1989

🎬 Mars Callahan's Movies

That Thing You Do!
Ernie the Disc Master Engineer
1996
Kalifornia
Walter Livesy
1993
Highway to Hell
State Policeman
1991
Clifford
Brian
1994
Poolhall Junkies
Johnny
2002
The Children of Times Square
Brian (as Gregory 'Mars' Martin)
1986

📝 Created / Written by Mars Callahan

What Love Is
Director
2007

Never Miss a Show Starring Mars Callahan

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