Jenkins later voiced the character of Officer Charlie Dibble on the Hanna-Barbera TV cartoon, Top Cat (1961–62). He was a regular on the television sitcom Hey, Jeannie! (1956–57), starring Jeannie Carson and often portrayed Muggsy on the 1950s-1970s CBS series The Red Skelton Show. He was also a guest star on many other television programs, such as The Man from U.N.C.L.E., Mr. & Mrs. North, I Love Lucy, Playhouse 90, The Ernie Kovacs Show, Zane Grey Theater, and Your Show of Shows. He had a cameo appearance in It's a Mad, Mad, Mad, Mad World (1963). Eleven days before his death, he made his final appearance, at the end of Billy Wilder's remake of The Front Page (1974); it was released posthumously.