Death to the Doctor (unproduced TV story)
From Tardis Wiki, the free Doctor Who reference
Death to the Doctor was a unmade script for Series 5 by Gareth Roberts. It would have featured a disgraced Sontaran called Strom. Steven Moffat would later inform a delighted Roberts that his character idea would see the light of day. This idea would become Commander Strax, who appeared in Series 6's A Good Man Goes to War. (REF: The Brilliant Book 2012)