sentences:  After the Catamounts' 2006–07 season, Mitchell left the school and played in the American Hockey League (AHL) for the Worcester Sharks.On March 31, 2007, Mitchell scored his first AHL goal against the Houston Aeros in a 7–3 victory.In the summer of 2007, Mitchell attended the San Jose Sharks' training camp, and on October 4, 2007, he played his first NHL game against the Edmonton Oilers.