“Terra Firma” is episode thirteen of season four of Farscape.
At the end of the previous episode, “Kansas”, Crichton and the others had rendezvoused with Pilot and Moya, which was in orbit around the Earth of the time he left, to find his father, and a number of others on board. His first reaction was to draw a weapon – not surprising, given that he had run into aliens in the past masquerading as his father.
The world is quite impressed with Crichton’s discovery of alien life – especially the technology, even if they don’t understand it. What to do with the technology is another question. Crichton wants the entire world to share it, but it’s a much more paranoid place than the one he left. Crichton also runs into an old girlfriend.
Grayza has left a spy on board Moya, and she wants to bring her command carrier through to Earth.