Sidney Blackmer

Sidney Blackmer Profile Photo

Characters played by Sidney Blackmer

Roman Castevet — Rosemary's Baby (1968)

Minnie's husband, an elderly man deeply involved in the Bramford's occult activities.

Big Boy — Little Caesar (1931)

The underworld overlord who commands the broader criminal hierarchy. Big Boy orders his men to avoid bloodshed, yet later rewards Rico's rise by giving him control of Chicago's Northside. His decision confirms Rico's position as the dominant local gang leader.

Humphrey Agnew — The High and the Mighty (1954)

Last-minute passenger exhibiting suspicious behavior. Escalates mid-air tension by confronting Ken Childs over a suspected affair, pulling a pistol, and forcing the crew and passengers to manage an internal threat alongside the mechanical failure.

Professor Brent — Tammy and the Bachelor (1957)

Academic figure connected to the Brent family estate.

Victor Karnoff — Charlie Chan at Monte Carlo (1937)

A millionaire whose messenger is ambushed and murdered, resulting in missing bonds worth $1,000,000. The investigation eventually leads to his mansion where the killer is exposed.

Lawyer George Renny — Love Crazy (1941)

Steve's defense attorney who advises him during the divorce proceedings. After spotting his client at a party, he devises the strategy of feigning insanity to legally postpone the divorce hearing, inadvertently leading to Steve's commitment to a sanitarium.

Swazey — The Little Colonel (1935)

Swazey is identified by Jack Sherman as one of the thieves responsible for the family’s financial disaster. Together with Hull, he sold Jack worthless land, leaving the family penniless and forcing Elizabeth to seek the deed and pursue a possible sale to a representative connected with the Union Pacific.

Austin Spencer — Beyond a Reasonable Doubt (1956)

Wealthy newspaper publisher, Susan's father, and the mastermind behind the political hoax. He convinces Tom to plant evidence to prove innocent men can be executed based on circumstantial evidence. He dies in a car accident before he can reveal the setup, but leaves a handwritten statement that ultimately confirms Tom's original story.

Al Mallon — It's a Wonderful World (1939)

Vivian's lover and co-conspirator in framing Willie Heyward for murder. He participates in the plot to inherit Heyward's fortune and later murders a replacement actor during a play while attempting to silence Ned Brown. He is ultimately caught fleeing with Brown.

Teddy Roosevelt — In Old Oklahoma (1943)

The United States president who hears the competing proposals from Daniel F Somers and James E. 'Hunk' Gardner, Teddy Roosevelt weighs whether established wealth or a broader opportunity for Native Americans and local farmers should guide development. His decision-making places the personal rivalry within the larger political struggle over Oklahoma's oil lands.

Sesemann — Heidi (1937)

Sesemann is Klara Sesemann's father and the head of the wealthy Frankfurt household where Heïdi Kramer is taken. At Christmas he offers Heïdi a home after seeing Klara walk again, but refuses her wish to return to Adolph Kramer. He later fires Fraulein Rottenmeier and can verify Heïdi's account to the police.

John Hart — Great God Gold (1935)

Known as “Lucky” John Hart, he is a stock market speculator whose reputation draws attention after he is interviewed by Phil Stuart. He sells his investments just before the Wall Street Crash, then considers using his reputation to profit from receiverships. His desire for Elena, Frank Nitto’s wife, leads to an affair.

Career Overview

Sidney Blackmer has 136 screen credits in a career dating back to 1914. Their work spans 11 cinematic universes — most prominently Hopalong Cassidy Collection with 2 titles. Signature works include Rosemary's Baby, Great God Gold, Woman Hungry. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.

Personal Facts

Known For
Acting
Gender
male
Known Credits
136
Birth Date
1895-07-12
Birth Place
Salisbury, North Carolina, USA

Known For

Associated Universes

Universe traveler — spans 11 universes

Frequent Collaborators

Credits

Content sources

Related entry on Wikidata (Q1592946), public domain (CC0).