All trivia for this title are spoilers.
UK DVD releases from Season 2 onwards are struck from edited international episode masters (allowing for commercials to be added for overseas broadcasts). The full uncut versions were originally broadcast on BBC One, without commercials. However, certain US DVD season releases (e.g. Season 3) contain the full uncut episodes.
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We asked Doctors Jo Wilson, April Kepner, and Andrew DeLuca to tell us the episodes of the show that they think are the most essential to understanding their characters.