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Earl Sigma was a blues player from Earth who played blues songs on Terra Alpha. However this style of music was deemed 'unhappy' and outlawed, leaving him with no means of income to buy a way off planet, stranding him there. He helped the Seventh Doctor through the Kandy Man's kitchen, snipers and loads of other dangers. After the Happiness Patrol and Helen A were deposed, Earl decided to stay and teach the people there the blues again. (DW: The Happiness Patrol)
- Sigma was not Earl's last name, but a designation given by Terra Alpha to people from other planets.