Both Virgin Publishing's Missing Adventures and BBC Books' Past Doctor Adventures have set stories in the UNIT era and have revealed new information about UNIT's past, present and future. The novel "Business Unusual" sees the Sixth Doctor assist UNIT in an investigation involving the now-retired Brigadier being held prisoner by the agents of the Nestene Consciousness, while "Deep Blue" sees the Fifth Doctor interact with the Third Doctor's UNIT colleagues at a time when his past self was away. "Bullet Times" pits the Seventh Doctor and Sarah Jane Smith against a branch of UNIT known as the 'Cortez Project', who consider "any" alien activity on Earth to be dangerous even if said aliens have no hostile intent, forcing the Doctor to discreetly work with a Chinese triad to help a crashed alien ship repair itself and depart.