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O

Cast & creator

O'Neill Monahan

Best known for The Middle, Monster: The Ed Gein Story, Summer Camp Island

Also known as: O'Neill Monohan

Movies

2

film credits

Series

6

television credits

Career

8

2009–2025 · acting roles

Credit score

6.5

average across scored titles

Signature credits

Known for

Ordered by popularity

The Middle

The Middle

Lucas · 2009

Monster: The Ed Gein Story

Monster: The Ed Gein Story

Cousin Geoff · 2025

Summer Camp Island

Summer Camp Island

Additional Voices (voice) · 2018

Teachers

Teachers

Ron · 2016

The Odd Couple

The Odd Couple

Noah · 2015

Across film & television

Filmography (8)

Search filmography

Showing 8 of 8 credits

The Middle

The Middle

Lucas

Monster: The Ed Gein Story

Monster: The Ed Gein Story

Cousin Geoff

Summer Camp Island

Summer Camp Island

Additional Voices (voice)

Teachers

Teachers

Ron

The Odd Couple

The Odd Couple

Noah

The Santa Clauses

The Santa Clauses

Teen

Killer Grandma

Killer Grandma

Young Tom

Let Us In

Let Us In

Christopher