Antonsen has participated in and contributed to several television and radio shows, including XL and XLTV (1998–99), Nissene på låven (2001), Uti vår hage (2003), Team Antonsen (2004), Tre brødre som ikke er brødre (2005), Etaten (2006), Uti vår hage 2 (2008), Dag (2010–15),[1] and Nissene over skog og hei (2011).

[2] Antonsen has cooperated with such comedians as Harald Eia, Bård Tufte Johansen, Kristopher Schau, Johan Golden,[1] and Espen Thoresen Hværsaagod-Takkskalduha.

[4] Antonsen is a member of German-language rock band DDR, most famous for their comical music videos, along with Johan Golden.

In 2012 he starred as King Arthur in the highly successful Norwegian staging of Spamalot, at Folketeatret in Oslo.

[1] In November 2022, Antonsen announced he was stepping down from the role[7] after being reported to the police by poet and author Sumaya Jirde Ali for racist remarks on 23 October 2022 at Bar Boca in Oslo.