After making "How to Frame a Figg", Knotts's five-film contract with Universal finished. He continued to work steadily, though he did not appear as a regular on any successful television series until his appearance on "Three's Company" in 1979. In the late 1960s and early 1970s, Knotts served as the spokesman for Dodge trucks and was featured prominently in a series of print ads and dealer brochures. On television, he went on to host a variety show/sitcom hybrid on NBC, "The Don Knotts Show", which aired Tuesdays during the fall of 1970, but the series was low-rated and short-lived, and Knotts was uncomfortable with the variety show format. He also made frequent guest appearances on other shows such as "The Bill Cosby Show" and "Here's Lucy". In 1970, he appeared as a Barney Fife-like police officer in the pilot of "The New Andy Griffith Show". In 1972, Knotts voiced an animated version of himself in two episodes of "The New Scooby Doo Movies": "The Spooky Fog of Juneberry", in which he played a lawman resembling Barney Fife, and "Guess Who's Knott Coming to Dinner". He appeared as Felix Unger in a stage version of Neil Simon's "The Odd Couple", with Art Carney as Oscar Madison, and toured in the Neil Simon comedy "Last of the Red Hot Lovers".