Doctor Who fan fiction.
A human soldier experiences a brief but terrifying war against the Sontarans, the race of warrior clones from the Doctor Who television series. Though the soldier never actually sees the Doctor himself, the latter's role in the ultimate destruction of the Sontaran vessel can be deduced from the shell-shocked speech of one of the victims of the attack: '"There was this man..." it said, trailing off as if there wasn't anything else to say.'
Unlike some other fan-fiction narratives that re-tell existing narratives from an outsider's point of view, this story doesn't seem to belong to any of the Sontaran stories from the original Doctor Who television series. Though Sonataran ships explode at the denouement of both 'The Time Warrior' (1973-1974) and 'The Sontaran Experiment' (1975), the former is set in the Middle Ages and the latter on a deserted future Earth, so neither is in keeping with the level of technology shown in this story.