During his career, Wahlgren appeared in films and television series, as well as his work in revues and farces such as Oh!

[1] Wahlgren grew up in Smedslätten, and debuted in 1945 in Ragnar Falck's short film Indianer och blekansikten.

[3] In the revue he did impressions of famous people like Jan Malmsjö, Jarl Kulle, Carl XVI Gustaf and Claes af Geijerstam.

[4] During the summer of 2001, he, along with Eva Rydberg, performed in the comedy Kärlek och lavemang at Fredriksdalsteatern in Helsingborg.

[5] He also did plenty of voice acting in several films such as Charlie and the Chocolate Factory and Nanny McPhee.