The Professor is a 1919 American silent comedy film made at the Chaplin Studios for the First National film company starring Charlie Chaplin.
Chaplin abandoned production after finishing only one sequence: a single reel.
Chaplin appears not as his usual Tramp character but as "Professor Bosco", a slovenly showman who brings his flea circus with him when staying at a flophouse.
The fleas get loose during the night and create havoc.
The surviving film is included in Unknown Chaplin and on the Criterion Collection Limelight Blu-ray and DVD release.