Watch as he describes his part in the flick and how he relates to the character.
The premiere marks Tom's first red carpet appearance since his split from Katie Holmes in June.
Holmes was also seen Monday night in NYC at the Broadway Dreams Foundation's "Champagne and Caroling" gala.
"Jack Reacher" hits theaters December 21.
Actor Tom Cruise appeared in front of screaming fans in London on Monday at the premiere of the new crime thriller, "Jack Reacher."