Christopher Held
Christopher Held  is the actor who played  in the  first season episode . He filmed his scenes between Tuesday  and Monday  at Desilu Stage 9, Stage 10, and on location at the 40 Acres backlot.

He was born as Carl Held in Jersey City, New Jersey, and is also known as Karl Held. Held was married to fellow Star Trek guest star Sarah Marshall from July 20, 1964 until her death on January 18, 2014. He visited the set in  during filming of , in which Marshall guest starred.

Held has appeared in over fifty films and television shows in a career spanning three decades. In the early 1960s, he had a brief recurring role on the long-running series Perry Mason, playing the title attorney's assistant, David Gideon. He later starred in the 1970s British television series The Lotus Eaters. From 1986 through 1989, Held portrayed the role of Garth on the primetime soap opera Falcon Crest.

In addition to his regular and recurring roles, Held had guest spots on such series as 77 Sunset Strip (with Bill Quinn), The Outer Limits (with Martin Landau), The F.B.I. (with Stephen Brooks and Paul Fix), Cimarron Strip (with Paul Carr), The Invaders (with Lawrence Montaigne and Alfred Ryder), Thriller (with Kim Darby), Space: 1999 (starring Martin Landau and Nick Tate), Charlie's Angels (directed by Cliff Bole), Riptide (with Ray Wise), Santa Barbara (with Nicholas Coster and Louise Sorel), and Scarecrow and Mrs. King (with Vince Howard and Gary Lockwood). 

His most recent television appearance was in the infamous "Good to the Last Drop" episode of L.A. Law in 1991. This episode featured the death of Diana Muldaur's character after falling down an elevator shaft. It also featured series regular Corbin Bernsen as well as Daniel Benzali, Roy Brocksmith, Lawrence Dobkin, and Robert Walker.

Held has been featured in a number of feature films, as well, with uncredited roles in 1961's The Outsider (co-starring Stanley Adams and Paul Comi), the 1967 Disney comedy The Gnome-Mobile, and the 1971 James Bond film Diamonds Are Forever (also featuring Sid Haig and Marc Lawrence). He also had credited supporting roles in the 1965 thriller 36 Hours (co-starring James Doohan, Roy Jenson, and Celia Lovsky) and the 1965 Disney comedy That Darn Cat! (with Frank Gorshin).

In 2006, Held acted on film for the first time in 15 years, appearing in low-budget horror film Bad Blood.

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Performers
TOS performers