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contrary to many beliefs the Raymond burr version was not the original, Warner Bros. released a series of six Perry Mason films in the 1930s.

The Case of the Howling Dog (1934), with Warren William as Perry Mason and Helen Trenholme as Della Street.
The Case of the Curious Bride (1935), with Warren William and Claire Dodd as Della Street. Notable for the first-released American screen appearance of Errol Flynn as the corpse, who is seen alive but not speaking in a brief flashback.
The Case of the Lucky Legs (1935), with Warren William and Genevieve Tobin as Della Street.
The Case of the Velvet Claws (1936), with Warren William and Claire Dodd as Della Street Mason.
The Case of the Black Cat (1936) (from The Case of the Caretaker's Cat [1935]), with Ricardo Cortez as Perry Mason and June Travis as Della Street.
The Case of the Stuttering Bishop (1937), with Donald Woods as Perry Mason and Ann Dvorak as Della Street.