The man whose semen could travel through time - we were on leave when the first reports came in - minor disturbances in causality of the kind that don't usually pose a threat. We assigned them the standard level of priority and hoped it wouldn't escalate.
But the reports continued. Traces of 21st century semen were found to have infiltrated the Mesozoic. Local disturbances were also reported: similar traces present in the 19th and early 20th centuries. The infiltrations had not yet reached public consciousness, but headquarters was beginning to worry.
"Who's been ejaculating in the timestream?"
This was the question on all of our minds. The breakthrough came when several ounces were discovered to have infiltrated Germany in 1953, materializing on a fur coat worn by Mrs. Lena Osterhout of Berlin. Immediately the word went out - 'URBAN WOMEN UNDER THREAT FROM TIME-TRAVELLING SEMEN.' A direct tracer probe was successful in locating the source of the breach. Chronic argonauts were dispatched at once.
Mr. Lee Hyun-Ki was located in Pusan, Korea on the morning of July 15, 2076. The intervention came in from the 73rd ordinal, with reinforcement from the second-stage interphase. Mr. Lee was successfully removed from sequence and placed in custody. A pathological analysis of Mr. Lee's prostate gland revealed large amounts of temporal radiation.
Before Mr. Lee could be questioned properly, new reports revealed that the semen had already bypassed the differentials and was crossing the sidereal boundaries, impregnating dogs, hominids, and other pre-evolutionary lifeforms. The precision of the infiltrations made it clear that this was an inside job. A mobile team was dispatched to exterminate the resultant hybrids and cauterize the time asymptote. All ports were re-sequenced.
At his trial, Mr. Lee admitted, under hypnosis, to having made deals with outside powers as a child. Although he retained no conscious memory of the transactions, hypnotic playback allowed for headquarters to land a tracer on the infiltration route. The codes were de-sequenced and cross-filtered.
As the trial wound down, several men and women thought to be Mr. Lee's children were removed from sequence and made to testify. All of them were the products of 'virgin births' - of mothers falling pregnant without apparent cause. DNA analysis revealed that all of them were Lee's descendents. One of those cross-examined, Mr. Edward Highbridge of Boston, Massachusetts, reported that, just prior to his conception in 1863, his mother had reported contact with a 'ghost figure' or 'apparition' which descended through the ceiling as she lay asleep in her bed, conscious but unable to move. Another, Mr. Giovanni Tretta of Milan, removed from sequence in 1535, claimed to be the son of an incubus which had raped his mother. Mr. Lee claimed no conscious knowledge of these events, but serio-feedback revealed a partial 'masking' effect present in the interstitial field. After some deliberation, all of the witnesses testified against Mr. Lee, claiming his actions had adversely impacted their lives.
Mr. Lee's defense attorney claimed that since the damages had been inflicted without his knowledge, Mr. Lee could not be prosecuted in any reasonable court of law. The jury deliberated for five hours before declaring Mr. Lee innocent of conscious subversion, but in accordance with Article 10 of the de-sequencing protocol, Mr. Lee and the contaminated witnesses were detained indefinitely. The time-active prostate was removed and replaced with a prosthesis. A diagnostic of the initial conditions in the differential field estimated an 83% salvage rate.