The Doctor was susceptible to gases in the praxis range. (TV: The Caves of Androzani, AUDIO: Planet X) The Eighth Doctor had a reaction to the gas during the Last Great Time War. (AUDIO: A Heart on Both Sides)
The only known producer of the drug was the Pilots' Coterie, whose members used it to distort the continuum in their calculations of space-time events for piloting ships like the Bababadalgharaghtakamminarronnkonnbronntonnerronntuonnthunntrovarrhounawnskawntoohoohoordenenthurnuk. Their praxis took the form of a tasteless gelatinous biomass, and humanoids needed to ingest at least 10 times their own body weight before it had any useful effect. However, there were many more efficient sources beyond the frontier in time.
Praxis played a role in Earth's history, as well. The Saragossa manuscript, recovered in the early 19th century by Count Potocki, recounted von Worden's experience of false consciousness. The Rivera Manuscript described a similar praxis fugue, this time forced on a renegade of the Great Houses by the enemy. A note on the latter manuscript, written in English but by an alien hand, said, "Praxis is not a drug. Praxis is not a weapon. Praxis is not a training manual. Praxis is what we were meant to become." (PROSE: The Book of the War) Avus fell into a pool of praxis in an alter-time realm and also experienced a fugue. (PROSE: Cobweb and Ivory)
House Xianthellipse sponsored the ruling caste of a posthuman colony to produce the drug for them; Robert Scarratt became addicted to praxis during his time working there. Under its influence, he (reportedly) single-handedly defused a local uprising caused by native resentment at the rulers' high-handed attitudes. In reality, his native contacts undoubtedly played a major role. (PROSE: The Book of the War)
Godmother Antigone of Faction Paradox sent Cousin Rupert to Bankside to investigate Haribeaux's Blue Praxis experiments; however, these claims were merely an excuse to ensnare Rupert into Father Christèmas' plan. (PROSE: Weapons Grade Snake Oil)
Behind the scenes Edit
- With its role in posthuman piloting, praxis is very similar to the drug melange from Frank Herbert's classic 1965 science fiction novel Dune. The brief summary of Robert Scarratt's defusing of an uprising on the sole planet where praxis is produced closely mirrors Paul Atreides's role in the plot of Dune.