
Moyer MacClaren Bupp (January 10, 1928 – November 1, 2007) professionally known as Sonny Bupp, was an American child film actor and businessman. His most notable film was Citizen Kane (1941), in which he appears as Junior, Charles Foster Kane III, the eight-year-old son of Charles Foster Kane and his first wife, Emily. Bupp was the last surviving credited member of the Citizen Kane cast at his death.

Citizen Kane
1941 · as Charles Foster Kane III

Sergeant York
1941 · as Boy in Sunday School (uncredited)

On Borrowed Time
1939 · as Boy in Tree (uncredited)

All That Money Can Buy
1941 · as Martin Van Buren Aldrich (uncredited)

Queen of the Mob
1940 · as Newsboy

Emergency Squad
1940 · as Peter

Hunted Men
1938 · as Smallest G-Men Club Member

Three Faces West
1940 · as Billy Welles

Michael O'Halloran
1937 · as Sarge (uncredited)

When Tomorrow Comes
1939 · as Boy Hiding from Policeman (uncredited)

And Sudden Death
1936 · as School boy

Abe Lincoln in Illinois
1940 · as Willie Lincoln (uncredited)

Love Is on the Air
1937 · as Billie - Boy on Radio Program

Man Hunt
1936 · as Young Boy (uncredited)

The Great O'Malley
1937 · as Boy with Lollipop (uncredited)

Missing Witnesses
1937 · as Little Boy (uncredited)

One Foot in Heaven
1941 · as Boy (uncredited)

Bad Men of Missouri
1941 · as Young Grat