12 Years Ago, 'Doctor Who's Most Unhinged Episode Revealed the Doctor at His Worst

Peter Capaldi's Twelfth Doctor has plenty of outstanding moments, but one episode in particular shows the Time Lord at his worst. Doctor Who has never shied away from showing the Doctor at his worst. In “A Good Man Goes to War,” Eleven (Matt Smith) realizes that his choices have made him nearly as monstrous as his enemies. In “The Waters of Mars,” Ten (David Tennant) is still reeling from the loss of his most recent companion, Donna Noble (Catherine Tate), and determined to win for once. He uses his power over time to save people whose deaths are fixed points in history, consequences be damned. It’s a genuinely shocking, villainous moment for the Time Lord.