Ian Chesterton

One of the First Doctor's companions and a science teacher at Coal Hill School.  He accompanied the First Doctor on a series of adventures, during which he showed Za how to make fire, and met the Daleks and Marco Polo.  Ian was accused of murder on Marinus, then went on to encounter the Aztecs and Sensorites.  He became temporatily miniaturized to ant size, then helped to rescue Vicki.  Ian was later captured by Roman slave traders and fought the Zarbi.  After being pursued through time and space by the Daleks, he and Barbara eventually decided to return to London in the Dalek Time Machine captured by the Doctor.  They arrived two years after they had left.