Career
Mäntylä began acting in 1979 and has made many appearances mostly on television in Finland since the early 1980s although he had appeared in several films such as the 1983 James Bond spoof Agentti 000 ja kuoleman kurvit where he acted alongside actors Ilmari Saarelainen and Tenho Sauren. He had a small role in the 2005 Timo Koivusalo film Kaksipäisen kotkan varjossa alongside actors such as Mikko Leppilampi. More recently he appeared on Finnish television in Football Club Venus, 2005 and in two episodes of "Presidentit" in 2006.