He is remembered for voicing Robby the Robot in the science fiction film Forbidden Planet (1956), a role he reprised in the lesser-known The Invisible Boy (1957).

When a singer named Marvin Miller debuted on another St. Louis radio station, he began using his middle initial to distinguish himself from the newcomer.

[2] Miller played Dr. Lee Markham on The Woman in White on NBC radio and Howard Andrews on Midstream on the Blue Network[3] and appeared as "The voice of the Past" on the May 21, 1942 broadcast of The Right to Happiness.

[13][14] From 1949 to 1950 Miller starred as Dr. Yat Fu on the short-lived ABC series Mysteries of Chinatown, with Gloria Saunders cast as his niece, Ah Toy.

[15] In 1961, Miller guest-starred as Johnny Kelso, with Erin O'Brien, in "The Marble Slab" episode of the Frederick Ziv-, United Artists-, and MGM-produced Bat Masterson, starring Gene Barry.

[18][19] Miller crossed paths with other prolific voice-over artists many times in his career, including June Foray, playing "Deer" in Hemo the Magnificent and in the TV series Rocky and Bullwinkle along with Paul Frees, who voiced "Boris Badenov" in that program.

[20] Miller and Frees also performed in separate segments on the audio recording Stan Freberg Presents The United States of America Volume One The Early Years.

In more than 200 episodes of The Millionaire, Miller played Michael Anthony, conveying the wishes of the "fabulously wealthy" John Beresford Tipton Jr., voiced by Paul Frees.