When he was about fourteen, he got his first chance to act in a legitimate stage show, and appeared as "Billy" the page boy, in support of William Gillette in "Sherlock Holmes". At the close of this engagement, Charlie started a career as a comedian in vaudeville, which eventually took him to the United States in 1910 as a featured player with the Fred Karno Repertoire Company.
He scored an immediate hit with American audiences, particularly with his characterization in a sketch entitled "A Night in an English Music Hall". When the Fred Karno troupe returned to the United States in the fall of 1912 for a repeat tour, Chaplin was offered a motion picture contract.
He finally agreed to appear before the cameras at the expiration of his vaudeville commitments in November 1913; and his entrance in the cinema world took place that month when he joined Mack Sennett and the Keystone Film Company. His initial salary was $150 a week, but his overnight success on the screen spurred other producers to start negotiations for his services.
At the completion of his Sennett contract, Chaplin moved on to the Essanay Company (1915) at a large increase. Sydney Chaplin had then arrived from England, and took his brother’s place with Keystone as their leading comedian.
The following year Charlie was even more in demand and signed with the Mutual Film Corporation for a much larger sum to make 12 two-reel comedies. These include "The Floorwalker", "The Fireman", "The Vagabond", "One A.M." (a production in which he was the only character for the entire two reels with the exception of the entrance of a cab driver in the opening scene), "The Count", "The Pawnshop", "Behind the Screen", "The Rink", "Easy Street" (heralded as his greatest production up to that time), "The Cure", "The Immigrant" and "The Adventurer".