The human dreadnought Nemesis goes back in time to the 21st century to stop the Reptid mothership unleashing a weapon that can change human history - unknowingly taking the weapon with them.
As the biological weapon forces their emotions to overcome the limiters and increase, the crew encounter a smuggler whose sidekick causes hallucinations.
Their moods and behaviour becoming ever more erratic, the crew 'port to earth to find a very ancient being who might have information that could help them. The Reptid they collect along the way may also be of use, if he lives long enough.
The arrival of a hybrid traveller from the future causes the Nemesis to crash beyond all hope of repair in an icy waste. The doctor's plan to found their own colony seems the only option for survival - but could love solve the problem?
Horribly hungover from trying the doctor's experimental alcohol, the crew are helpless against the hologram's nefarious machinations. It's up to the janitor to save the day - if he can.