Maassen won two of the biggest comedy contests in the Netherlands in 1990, the Groninger Studenten Cabaret Festival(GSCF), and Cameretten. The GSCF jury was not pleased with the quality of the contestants that year, and gave Maassen the first prize, remarking he was the best of the year, but still not very good. In the following years, however, Maassen fame grew steadily, especially amongst students. Maassens style was based on stand-up comedy: Alone on stage, telling jokes and stories to amuse the public, without any musical support (a thing common for most Dutch comedians up to that point). Since 2000, Maassens shows are shown on Dutch national television, making him more and more a household name.

Twister
1989
5.5/10

Theo Maassen: Functioneel Naakt
2001
6.4/10

Nostradamus: 2012
2009
5.5/10

The Peasants
1939
5.0/10

Dharmaveer 2
2024
6.0/10

Skin of a Mandarin
2023
9.5/10

3D Saamri
1985
5.0/10

El Asesino del Zodiaco
1993
2.8/10

Das Leben ist ein Bauernhof
2012
5.6/10

Taxi mortal
1980
5.0/10

Aapo
1994
5.0/10

Abrek Zaur
1926
5.0/10

The Encounter of a Lifetime
1952
6.0/10

The Love Story of Chun-hyang
1961
4.0/10

Projota - AMADMOL (A Milenar Arte de Meter o Louco)
2017
6.1/10

What a Strange Way of Life
2015
5.0/10

Let's Call Her Lisa
2018
6.0/10

The Dachshund
2025
8.0/10
Droog Brood: Toppers in de Mist
2013
0/10