Helberg wrote and starred in the short-lived 1977 syndicated TV series The Lorenzo and Henrietta Music Show and the 1979 CBS TV series Flatbush. He has made numerous guest appearances on TV shows, including Trapper John, M.D., Remington Steele, Newhart, The Jeffersons, M*A*S*H, Married... with Children, The Wonder Years, Night Court, Fernwood Tonight, Knight Rider, Too Close for Comfort, Get a Life, House Calls, Cybill, and Days of Our Lives among others.