On television, Libertini was a series regular in the first season of "Soap" as the Godfather. He appeared as 3 different characters in "Barney Miller". He also appeared in "Evaluation" (1978) and "Middle Age" (January 1979). He guest starred in the "" episode "Accession" as a Bajoran named Akorem Laan, and in the "Sonny with a Chance" episode "Dakota's Revenge" as Izzy, an insane mechanic. He also voiced Wally Llama on "Animaniacs", and starred in three short-lived sitcoms: "Family Man" (1988), in which he played a middle-aged comedy writer who married a much younger woman and became a father late in life; "The Fanelli Boys" (1990–1991), in which he played an Italian priest; and "Pacific Station" (1991–1992), in which he played a police detective.