A man of stocky build who possessed a deep, rich voice, he proved equally adept at portraying characters in Shakespearean plays, Westerns, and modern crime dramas.

Following his discharge, he resumed acting in Hollywood, where he soon began to receive more substantial, credited roles in releases by smaller production companies, such as The Burning Cross and The Road to the Big House for Somerset Pictures Corporation in 1947.

[citation needed] Doucette continued to progress in obtaining dramatic roles for larger studios, including a small part as an architect in The Fountainhead in 1949.

Doucette also appeared in the John Wayne films The Sea Chase, The Sons of Katie Elder, True Grit, and Big Jake as well as portraying Gen. Lucian Truscott in the 1970 epic Patton.

He appeared on a variety of television shows, including The Time Tunnel, Racket Squad, The Range Rider, Wagon Train, The Roy Rogers Show, The Fugitive, The Adventures of Kit Carson, The Cisco Kid, City Detective, Annie Oakley, The Joseph Cotten Show: On Trial, My Friend Flicka, Sky King, The Californians, Broken Arrow, The People's Choice, Sheriff of Cochise, Bat Masterson, Behind Closed Doors, The Texan, Lawman, The Everglades, Mackenzie's Raiders, Bonanza, The Wild Wild West, The Virginian, Have Gun - Will Travel, Kung Fu, The Rat Patrol, Hogan's Heroes, Adventures of Superman, Sea Hunt, Science Fiction Theatre, Walt Disney Presents, and Tales of Wells Fargo.