escape the timeless Divergent universe—Rassilon having previously filtered the Zagreus energies out of the Doctor upon his arrival in this universe without the Doctor's knowledge—but Rassilon and the Kro'Ka remain trapped in a permanent loop. Rassilon's next audio appearance comes in Desperate Measures, concluding the ninth series of Big Finish Productions spin-off Gallifrey. During the Time War the Time Lord Valerian (David Sibley) becomes a host through whom Rassilon is resurrected to lead Gallifrey. These events will lead into the tenth series of the spin-off where the part will be played by Terrence Hardiman. This season ends with Romana attempting to arrange an assassination to stop his dictatorship, ending with Rassilon beginning to regenerate. The series ends on a cliffhanger as he uses his regeneration as a propaganda opportunity. In Doctor Who: The Adventure Games, Rassilon's Final Sanction is mentioned when Amy Pond looked at a Time Lord Staff that the Eleventh Doctor kept in his study. Rassilon features in the War Doctor novel Engines of War by George Mann, which looks at the events that led to the War Doctor's decision to use the Moment, including the discovery that Rassilon has resurrected Borusa as a possibility engine to help him decide what actions he should take during the war. Rassilon returns to Gallifrey in the Titan Comics 2016 multi-Doctor event story Supremacy of the Cybermen, which depicts the last Cybermen at the end of the universe forming an alliance with Rassilon with the goal of conquering Gallifrey and using Time Lord energy to regenerate the universe into one under Cyber-control. Although Rassilon's insight allows the Cybermen to conquer history and defeat all of the past Doctors, the Twelfth Doctor is able to convince Rassilon to help him after the Cybermen betray Rassilon, the two turning the Cybermens' equipment against them so that the universe is 'regenerated' to a point before the Cybermen conquered Gallifrey. Although the Twelfth Doctor is the only one shown to remember these events, he is shown speculating that Rassilon may also remember the horrors of what he did. In the subsequent Titan Comics special The Lost Dimension, the Eleventh Doctor briefly accidentally travels back to ancient Gallifrey where he assists Rassilon in a testflight of the very first Tardis. List of appearances Television The Five Doctors "The End of Time" "Hell Bent" Novels Cat's Cradle: Time's Crucible Engines of War Comics "Star Death" (Doctor Who