1960s and 1970s
In the 1961–1962 television season, Lembeck played a theatrical agent, Jerry Roper, in the ABC sitcom The Hathaways, starring Peggy Cass and Jack Weston as "parents" to the performing Marquis Chimps. He appeared twice as Al in "Variations on a Theme" and "Music Hath Charms" (both 1961) on another ABC sitcom, The Donna Reed Show.
Having spent a great deal of his adult life in uniform, Lembeck once again donned Navy togs in the 1962–1963 season to co-star with Dean Jones in the NBC sitcom Ensign O'Toole. He co-starred with Steve McQueen in Love with the Proper Stranger and then spent part of the early 1960s playing the lovable bad guy malaprop Eric Von Zipper in six American International beach party films, with Frankie Avalon and Annette Funicello. (He did not appear in the second "beach" film, 1964's Muscle Beach Party.) The Von Zipper character, leader of the Rat Pack motorcycle gang, was a parody of Marlon Brando's role in The Wild One (Von Zipper reveals in Beach Blanket Bingo that one of his idols was "Marlo Brandon".) Among other things, Von Zipper pronounced his judgments on others by saying "Him, I like", or "Him, I do not like". He was called an "instant audience favorite". In 1964, he also co-starred with Debbie Reynolds in The Unsinkable Molly Brown.
In 1964, Jack Kosslyn of the Mercury Theatre asked Lembeck to take over his actors' workshop. Lembeck took this opportunity to create his comedy workshop. Initially working with comedy scripts, he soon ran out of good comedy material and found that improv was a wonderful tool to teach and exercise comedy. He realized that the improv method, new in the early 1960s, was one of the best ways to develop actors' comedy instincts. Lembeck returned to the theatre to star as Sancho Panza in the first national company of Man of La Mancha. President Lyndon Johnson chose this company to give a command performance at the White House.
During the late 1960s and 1970s, Lembeck became a mainstay on television, making over 200 guest appearances, including Ben Casey, Mr. Novak, The Munsters, The Man from U.N.C.L.E., Route 66, The Monkees, Night Gallery, It Takes a Thief, The Partridge Family, Chico and the Man, Vega$, All in the Family, Hawkins, Batman and Mork & Mindy.
Lembeck also directed the road companies of Stalag 17 and Mister Roberts, along with the revues A Night at the Mark in San Francisco and Flush in Las Vegas.
