The seventh Doctor met another agent, Isaac, who showed him the abducted Susan.Meanwhile, Ace met the similarly kidnapped Sarah Jane and Peri. The Doctor learned that Threshold were an organisation that opened doors in space and time for their clients - their clients in this case being creatures living with the collective unconscious of mankind, the Lobri, who manifested as giant fleas. The TARDIS interior was heavily damaged. Ace sacrificed her own life to save the Doctor from the creatures - but the last Lobri nonetheless started to manifest on Earth. The Doctor materialised the TARDIS inside the Lobri, destroying it. He then returned his surviving companions to their rightful places in time, and was left travelling alone.Tracks for a linear-induction monorail on Mars were first laid in 2093. Terraforming efforts started in 2095; the University of Mars was founded in the same year. [225] 2096 - The Indestructible Man [226]Inter-continental travel was impossible, and the world was broken into city-states.
