Her television career included appearances in Lux Video Theater, Alfred Hitchcock Presents, Dennis the Menace, Perry Mason, The Time Tunnel, Adam-12, and for three seasons on the television version of Peyton Place as Nurse Esther Choate.
It was a prominent part of the plot of Crack of Doom, an episode of the Irwin Allen television series, The Time Tunnel in 1966.
However, he is probably best remembered for his prolific work on the Irwin Allen TV series Lost in Space, The Time Tunnel, Voyage to the Bottom of the Sea and Land of the Giants.
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In the 1960s Pyramid published a few novelizations of Irwin Allen television shows, including one for Lost in Space and two others for The Time Tunnel.
Hagen guest starred seven times on Gunsmoke, six times on The Big Valley, five times each on Bonanza, Laramie, and Have Gun - Will Travel, four appearances on Mannix and The Time Tunnel, and three appearances on Perry Mason, two of them in 1965: as murderer Jacob Leonard in "The Case of the Gambling Lady," and Samuel Carleton in "The Case of the Fugitive Fraulein."
Born in Kiel, Germany, he wrote for many 1960s and 1970s television shows including Naked City, Mannix, The Time Tunnel, Police Woman, Star Trek ("The Galileo Seven" and "Dagger of the Mind"), Gunsmoke, Have Gun — Will Travel, The Paper Chase and Lost in Space.