AS SEEN ON TV: BILLY THE KID

AS SEEN ON:
'Stories Of The Century'

AS PLAYED BY:
Richard Jaeckel

Henry McCarty (November 23, 1859— July 14, 1881), better known as Billy the Kid, but also known by the aliases Henry Antrim and William H. Bonney, was a 19th-century American frontier outlaw and gunman who participated in the so-called Lincoln County War. According to legend, he killed 21 men, one for each year of his life, but he most likely participated in the killing of fewer than half that number.

McCarty (or Bonney, the name he used at the height of his notoriety) was 5 ft 8 in-5 ft 9 in tall with blue eyes, a smooth complexion and prominent front teeth. He was said to be friendly and personable at times, and many recalled that he was as "lithe as a cat".
(from Wikipedia)

As it's "Two For Tuesday", here's another look at Billy the Kid:
AS SEEN IN:
'The Time Tunnel'

AS PLAYED BY:
Robert Walker, Jr.

As for the reason why they would look different, it's because Walker's personification of Billy is from a parallel dimension which Doug and Tony accessed via the Time Tunnel.

BCnU!