The TARDIS seems to have a penchant for landing in the middle of battles on Earth. In this case it's a Scottish rebellion put down by the English troops. Jamie, a piper for Bonnie Prince Charles, ends up being pulled out of the battle and into the TARDIS by Polly and Ben. The doctor agrees to take him along in trade for bagpipe lessons.
Jamie was the longest running companion with 113 episodes. In "The War Games" story where the Time Lords put the doctor on trial and re-generate him, Jamie and Zoe have their memories of the doctor erased and are returned to their original time.
Jamie is played by Frazer Hines. He was born on Sept 22, 1944 in Yorkshire, UK. Before Dr Who, Frazer was a child star and then appeared in eight movies, and after Dr Who he has remained a successful actor.