Marlowe appeared seven times on Wagon Train, six times on Gunsmoke, and twice on Dick Powell's Zane Grey Theater. Her many other guest-starring roles included Schlitz Playhouse, 77 Sunset Strip, Hawaiian Eye, The Millionaire, Shotgun Slade, Hotel de Paree, General Electric Theater, 87th Precinct, Frontier Circus, The Alfred Hitchcock Hour, The Donna Reed Show, Petticoat Junction, Going My Way, Twelve O'Clock High, Family Affair, The Green Hornet, Lassie, Bridget Loves Bernie, Here Come the Brides, Barnaby Jones, Medical Center, Cade's County, Cannon, The Rockford Files, The Big Valley, The Guns of Will Sonnett, The F.B.I., Marcus Welby, M.D., The Outer Limits, The Bob Newhart Show, The Streets of San Francisco, and most notably her two appearances on The Twilight Zone: the 1961 episode "Back There" and the 1964 episode "Night Call".