On what TV series was William Shatner a regular before "Star Trek" (NBC, 1966-69)?

William Shatner a regular on the TV series “For the People” (CBS, 1965) before appearing on “Star Trek” (NBC, 1966-69).

Shatner played Assistant District Attorney David Koster.

Why did Dick York leave the TV series “Bewitched” (ABC, 1964-72)? Dick York leave the TV series "Bewitched" (ABC, 1964-72) primarily for health reasons. As a result of a back injury during the filming of They Came to Cordura (1959), he developed a degenerative…
Which movie epic is longer, Gone With the Wind (1939), or Heaven’s Gate (1980)? Gone With the Wind is longer, by one minute. It runs 220 minutes. Heaven's Gate was originally shown at 219 minutes, but was later cut to 149 minutes.
What were the first names of the shipwrecked Robinsons in the TV series “Lost in Space” (CBS, 1965-68)? Will Robinson (Billy Mumy) is easy to remember from the many scenes in "Lost in Space" where the Robot shouts things like "Danger, Will Robinson!." The other Robinsons were his sisters Penny (Angela…
What were the first names of Scott, Chekov, and McCoy on “Star Trek” (NBC, 1966-69)? Their first names of Scott, Chekov, and McCoy on "Star Trek" are as follows: Montgomery Scott Pavel Andreivich Chekov Leonard McCoy
What was the name of the Italian mouse on “The Ed Sullivan Show” (CBS, 1948-71)? The name of the Italian mouse on "The Ed Sullivan Show" (CBS, 1948-71) was Topo Gigio.
On what film was Jean Harlow working when she died? Jean Harlow was working on the film Saratoga (1937) when she died.