After making How to Frame a Figg, Knotts' 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. He also made frequent guest appearances on other shows such as The Bill Cosby Show and Here's Lucy. In 1970, 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 also appeared as Felix Unger in a stage version of Neil Simon's The Odd Couple, with Art Carney as Oscar Madison.