Survival Stratagem

The Survival Stratagem was the Tremas Master's name for his confrontation with the Cheetah People and the Seventh Doctor. According to his Masterplan Journal, the Master had ended up on the Cheetah Planet not long after the Sixth Doctor's trial and confrontation with the Valeyard. (PROSE: The Secret Diary of the Master, TV: Survival)

Aftermath

While the Master's fate after escaping the Cheetah World eventually led to his execution on Skaro, (TV: Doctor Who) the circumstances surrounding the time between his escape from the Cheetah World and his trial at the hands of the Daleks varied across accounts. (PROSE: Stop the Pigeon, Prime Time, The Eight Doctors; AUDIO: Dust Breeding) Missy herself admitted that her memory of what happened to the Master after being left stranded on Cheetah World was vague at best, to the extent that she was unsure said event had even taken place. (PROSE: Meet Missy!)

While most accounts had the Master go on various escapades prior to his execution, (PROSE: Stop the Pigeon, Prime Time; AUDIO: Dust Breeding) one account showed that the Master immediately surrendered himself to the Daleks after obtaining a Deathworm Morphant from the Morgs. As such, in this account it was the "Tremas" Master (PROSE: The Eight Doctors) who was exterminated after making a request for the Doctor to return his remains to Gallifrey after his execution. Using the Deathworm Morphant, the Master instead took the Doctor's TARDIS to 1999 San Francisco, where he possessed the body of an ambulance driver. (TV: Doctor Who)

By another account, right after the Cheetah Planet plot, the Master appeared in the Doctor's TARDIS and damaged it, intending to force the Doctor and Ace to face a new scheme. (PROSE: How did this creep get in here, Professor?)

According to another account, the Master became trapped on Earth without his TARDIS in the year 1957 after escaping the destruction of the Cheetah Planet by using a kitling named Shadow to transmigrate just as the planet exploded. The Master interrupted the first Soviet satellite launch and sent a distress signal to the Tzun Canton on Zeta Reticuli Four. He offered to help assimilate Earth into the Tzun Confederacy. In return, the Master asked for passage off Earth and the use of the Tzun's genetic engineering to cure his Cheetah virus infection. The Tzun accepted and prepared nanites for him that broke down the corrupted Trakenite DNA in his cells and restructured it. This was meant to restore the Master to being a "full" Time Lord, giving him a new regenerative cycle and curing the Cheetah virus. Shortly after being restored to his full Time Lord heritage, he was shot in the back by Ace to avenge his murder of Joe Manco, causing him to regenerate. Following the regeneration, the Master was able to make his escape, summoning his TARDIS using a Stattenheim remote control built from Tzun technology. (PROSE: First Frontier)

According to another account, the Master, still in Tremas's body, attempted to stave off the effects of the Cheetah virus by posing as a "Dr Howard Chithros" and draining the life from his elderly patients. The Seventh Doctor discovered the scheme and the nursing home was destroyed in the ensuing battle between the two Time Lords. The Master escaped in the confusion, leaving the Doctor to pick up the pieces. (PROSE: Stop the Pigeon) The Master attempted to gain a new body from a legendary race known as the Fleshsmiths, claiming that the Cheetah virus would kill his Trakenite body within a year, but his plan was stopped by the Doctor, who ejected the new body from the Fleshsmith vessel into space. (PROSE: Prime Time) Eventually, the Master learned of a device known as the Warp Core, a sentient powerhouse of mental energy designed as a weapon to safeguard the planet Duchamp 331. He tracked the Warp Core to Earth, intending to use it to power his TARDIS. Unprepared for its power and underestimating its outside awareness, he was attacked by the Warp Core, which stripped his Trakenite body from him and reduced him to his previous decaying form. (AUDIO: Dust Breeding)