He has appeared in such movies as:

• Heaven's Gate
• Mississippi Burning
• The Lord of the Rings: The Two Towers
• His appearance in The Lord of the Rings: The Return of the King was cut from the theatrical release but will be seen in the extended VHS and DVD version
• Ragtime
• Alien: Resurrection
• Escape to Witch Mountain
• Dune
• Child's Play, voice of Chucky
• Child's Play 2
• Child's Play 3

He has won an Academy Award for Best Supporting Actor.