In 1991, he appeared as Kuno in the Eino Baskin directed Tallinnfilm drama "Rahu tänav", starring Mikk Mikiver and Jüri Järvet. The following year, he appeared as Leo in the Mati Põldre directed biographical period drama "Need vanad armastuskirjad" for Freya Film about the life of Estonian musician and lyricist Raimond Valgre (played by Rain Simmul) during the 1930s and 1940s and following the banning of his works in 1948 by Soviet authorities. In 2007, Kilgas returned to the screen to play the spirit of legendary Estonian singer and actor Georg Ots in the Andres Maimik and Rain Tolk directed Kuukulgur Film road movie comedy "Jan Uuspõld läheb Tartusse"; a film that portrays Estonian actor and singer Jan Uuspõld as a down-on-his-luck caricature of himself trying to hitchhike from Tallinn to Tartu to perform in a role at the Vanemuine theatre. Tõnu Kilgas has also worked as a voice actor, most notably dubbing foreign animated films into the Estonian language. These include characters in the 2008 Walt Disney Studios Motion Pictures computer-animated science fiction comedy film "WALL-E"  and the DreamWorks Animation "Kung Fu Panda" franchise, among others. Tõnu Kilgas' first major part in television film was a starring role as Lembit Savikas in the 1978 Peeter Simm directed comedy film "Stereo", about a young veterinarian who arrives at a collective farm, only to be initially met with apprehension from the villagers. The film, however, was not permitted to be released by Soviet authorities and was only eventually shown on Estonian television in 1991, after Estonia regained independence from the Soviet Union. In 1981, Kilgas appeared as Ilya Fruntov in the Tõnis Kask directed two-part television film "Kaks päeva Viktor Kingissepa elust"; a biopic of Estonian communist politician Viktor Kingissepp. For many Estonians, Tõnu Kilgas is possibly best known for his role of Harry Ahven on the popular, long-running Eesti Televisioon (ETV) drama serial "Õnne 13". Kilgas has been a regular cast member of the series since it first aired in 1993.