Re: Doctor Who
It's fairly standard for a Doctor to go after 3 seasons. It's sometimes called 'Troughton's Law' as that's the advice he is reputed to have given Peter Davison, who had taken the role intending to go three years but when it came time to decide whether to commit to a regeneration story at the end of the upcoming season 21 he was losing his resolve to quit while he was riding high.
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