As a voice actor, Kevin Conroy is best known for his starring role as Bruce Wayne / Batman in the acclaimed Batman: The Animated Series (1992–95). He continued to voice Batman in numerous animated projects from which the series was spun off into, which collectively took place in what is known as the DC animated universe (DCAU). These spin-offs include the TV shows The New Batman Adventures (1997–99), Batman Beyond (1999–2001, in which he portrays an elderly Bruce Wayne retired from crimefighting), Justice League (2001–04) and Justice League Unlimited (2004–06) as well as the theatrical film Batman: Mask of the Phantasm (1993), and the direct-to-video films Batman & Mr. Freeze: SubZero (1998), Batman Beyond: Return of the Joker (2000) and Batman: Mystery of the Batwoman (2003). He also voiced Batman for the character's guest appearances in the DCAU's Superman: The Animated Series, Static Shock and The Zeta Project. Conroy is distinguished for being the first voice actor to use two distinct voices to portray Bruce Wayne and Batman. In a tally of performances that include every episode and movie portrayal of Batman in live-action and animation, Conroy has portrayed the character longer than any other actor.