The late, great Elisabeth Sladen made her first appearance in "The Time Warrior," and helped define the legacy of Doctor Who companions for decades after.
Former Doctor Who star Christopher Eccleston was brutally honest about what it would take to get him back on the show. He's still not over his early exit.
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The actor, who has spent 18 years slowly opening up about his time on Doctor Who, is now, at the very least, incredibly clear about what he'd need to return.