The Sixth Doctor was a controversial figure, on screen and off, by the end of his tenure on Doctor Who. At the time, Colin Baker’s exit was so tempestuous the actor did not return for the traditional hand-over of the role to his replacement, Sylvester McCoy. It led to one of the dodgiest wigs in Doctor Who history,…
Source: io9 – Colin Baker Regrets Not Filming His Doctor Who Regeneration