Scooby-Doo! the Mystery Begins

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George O'Brien Janet Gaynor Margaret Livingston Bodil Rosing J. Farrell MacDonald Glen Cavender Jim Farley Buster Keaton Francis X. Bushman Jr. Greta Schröder Malcolm St. Clair Charles Chaplin Edna Purviance Jackie Coogan Carl Miller Albert Austin Hilda Borgström Werner Krauss Conrad Veidt Lil Dagover Hans Heinrich von Twardowski Peter Lorre James Cagney Jean Harlow Edward Woods Joan Blondell Donald Cook Adolphe Menjou Pat O'Brien Mary Brian Edward Everett Horton Walter Catlett Bela Lugosi Helen Chandler David Manners Dwight Frye Edward Van Sloan Harry Myers Hank Mann John Wayne El Brendel Tully Marshall Chester Morris Wallace Beery Lewis Stone Robert Montgomery Lew Ayres John Wray Ben Alexander Charles Farrell David Torrence Guinn 'Big Boy' Williams Jack Benny Joan Crawford Francis Lederer Clare Greet Richard Arlen Blue Washington Harold Goodwin Sidney Bracey Harry Gribbon Maurice Schutz Harry Crocker George Davis Henry Bergman William Powell Myrna Loy Maureen O'Sullivan Nat Pendleton Minna Gombell Clark Gable Claudette Colbert Walter Connolly Roscoe Karns Jameson Thomas John Barrymore Lionel Barrymore Lois Wilson Sidney Blackmer Matt Moore Billy Bletcher Pinto Colvig Walt Disney Fay Wray Bruce Cabot Frank Reicher Warner Baxter George Brent Ruby Keeler Guy Kibbee Lionel Atwill Melvyn Douglas Maude Eburne George E. Stone Boris Karloff Zita Johann Arthur Byron Charles Laughton Paul Muni Glenda Farrell