He first appeared on TV on ABC's "The Jim Stafford Show," which aired in 1975, according to the outlet.In 1980, Gallagher's comedy stand-up special "An Uncensored Evening" was the first to ever air on cable television, according to his longtime former manager, Craig Marquardo.The comedian, who often wore a Tam o'Shanter hat, appeared on many talk shows throughout his career, including David Letterman's NBC and CBS shows, "The Tonight Show Starring Johnny Carson," "Match Game," "The Hollywood Squares" and Howard Stern's TV and radio programs, according to Deadline.In one visit to “The Tonight Show Starring Johnny Carson” in 1979, Gallagher took aim at fellow guest and comedian Chevy Chase who said his routine was "pretty much set up by machines," the outlet reported.“Chevy doesn’t like it if somebody else gets a laugh," Gallagher said, to which Chase responded “Just for the record I think he’s a fine young comedian and I think he’s going a long way.""