She appeared in two light-hearted episodes of Lost in Space as 'The Green Lady' (aka 'Lorelei'), stowaway Dr. Zachary Smith's most persistent and verdant admirer, while Smith was completely under her spell, to the complete peril of the Jupiter II, as usual; Have Gun – Will Travel as Della White Cloud, an Apache princess; and in episodes 24 and 26 of The Time Tunnel, "Chase through Time" and "Attack of the Barbarians". Marcus' most humorous role during this period was in an episode of The Man from U.N.C.L.E., "My Friend: The Gorilla Affair", in 1966. She guest-starred in the TV series Gunsmoke's episodes "The Squaw" as Natacea (1961) and "Old Comrade" as Missy (1962). In 1962, she portrayed "Wahkshum" in the episode "The Peddler" on CBS' Rawhide.