She co-starred in two television series in the 1970s. "Arnie", a sitcom starring actor Herschel Bernardi, debuted in 1970 and aired for two seasons on CBS. Langdon portrayed Lillian Nuvo, the wife of a loading dock foreman turned corporate executive, and won a Golden Globe award for her performance. "Grandpa Goes to Washington", an NBC hour-long comedy starring veteran actor Jack Albertson, featured Langdon as Rosie Kelley, the daughter-in-law of an over-65 maverick United States Senator. Premiering in 1978 opposite "Happy Days" and "Laverne and Shirley", the top-rated block of shows at the time, her third attempt at weekly episodic television lasted four months. A final stab at her own series came in the ABC comedy "When the Whistle Blows". A 1980 mid-season replacement, Langdon played Darlene Ridgeway, the owner of a saloon frequented by local construction workers. Another rare 60-minute comedy, it lasted ten weeks.