William Morgan Sheppard

William Morgan Sheppard (born 24 August 1932) is a British-born American film, television and voice actor. He played the older version of Canton Delaware in DW: The Impossible Astronaut. His son, Mark Sheppard, played the young version of Canton Delaware.

Outside Doctor Who, he's best known for his numerous appearances in other science-fiction series, including Star Trek. In 2000, he provided voices for the video game Star Wars: Force Commander and also played the role of Ignatius Cheese in the video game Escape from Monkey Island. In the mid-1980s, Sheppard played Blank Reg in both the original UK production of Max Headroom and its later American remake.