A Good Man Goes to War
Written by Gareth Roberts. Before settling upon the storyline that would become "The Lodger", Roberts initially developed a different storyline for the 2010 series which would have featured a disgraced Sontaran called Strom. This idea reached draft stage before being abandoned altogether. However the idea of Strom was later recycled into Sontaran Commander Strax, who first appeared in "A Good Man Goes to War" and became a recurring character.