For the remainder of her career, Merman worked as frequently as offers were made. In 1979, she recorded "The Ethel Merman Disco Album," with many of her signature songs are set to a disco beat. She was a guest host on a memorable episode in season 1 of The Muppet Show. Her last screen role was a self-parody in the 1980 comedy film "Airplane!," in which she portrayed Lieutenant Hurwitz, a shell-shocked soldier who thinks he is Ethel Merman. In the cameo appearance, Merman leaps out of bed singing "Everything's Coming Up Roses" as orderlies sedate her. She also appeared in several episodes of "The Love Boat" (playing Gopher's mother), guest-starred on a CBS tribute to George Gershwin, did a summer comedy/concert tour with Carroll O'Connor, played a two-week engagement at the London Palladium, performed with Mary Martin in a concert benefiting the theatre and museum collection of the Museum of the City of New York, and frequently appeared as a soloist with symphony orchestras. She also volunteered at St. Luke's-Roosevelt Hospital Center (now Mount Sinai West) working in the gift shop or visiting patients.