Meriwether appeared as Dr. Egret on the NBC series, "Man from U.N.C.L.E." ("The Mad, Mad Tea Party", 1965) and in an episode of "Hazel" ("How to Lose 30 Pounds in 30 Minutes", also 1965) she played Miss Wilson, the owner of an exercise studio. Meriwether portrayed The Catwoman for the "Batman" movie (1966), and also appeared in two episodes of the "Batman" TV series in 1967 as Lisa Carson, a love interest to Bruce Wayne in the episodes "King Tut's Coup" and "Batman's Waterloo". She also co-starred as scientist Dr. Ann MacGregor in the 1966–1967 television series "The Time Tunnel". In the late 1960s and early 1970s, she had guest starring roles in numerous TV series, including "The Fugitive", "The Lloyd Bridges Show", "Mannix", ' episode "That Which Survives" (1969), ' episodes 19 and 20 "The Bunker" parts I and II (1969), "Perry Mason" episode #245 "The Case of the Cheating Chancellor" 1965 and Perry Mason episode "The Case of the Frustrated Folksinger" 1965, and the "F Troop" episode "O'Rourke vs. O'Reilly".