Borusa uses the Time Scoop to transport the Doctor in the majority of his incarnations (along with various companions) to the Death Zone, using them to clear the way to the Tower.

In that story, Rassilon (played by Richard Mathews) appears as a disembodied image floating above his own sepulchre, but the nature of this apparition is not explained.

Doctor Who scriptwriter Gareth Roberts believed that Rassilon is dead and the face that appears is "a clever AI".

Head writer and executive producer Russell T Davies believed that Rassilon is "clearly alive", with his big face in the story being "A projection from the Matrix.

Doctor Who scriptwriter Mark Gatiss quipped that Rassilon is "biding his time until he regenerates into [actor] Daniel Craig".

According to scriptwriter Terrance Dicks, who wrote "The Five Doctors", Rassilon has "gone to a higher plane where he's a benevolent being who can, if he feels it's a big enough crisis, intervene".

[6] Rassilon (portrayed by Timothy Dalton) appears as the villainous mastermind of "The End of Time", the two-part finale of the series' 2009 Specials.

[8] With the prophecy deciphered that the Doctor would destroy Gallifrey to end the Time War, and told he would die on that day, Rassilon refuses to accept his fate and killed his advisor for speaking out against his plans.

Timothy Dalton was asked to reprise the role for the episode, but was replaced by Donald Sumpter as a regenerated Rassilon when he became unavailable for filming.

In the first story, "Star Death" (Doctor Who Magazine #47), we see Rassilon gaining the equipment to control time travel thanks to the failed initial attack.

In the Doctor Who audio plays produced by Big Finish Productions, Rassilon is voiced by Don Warrington.

According to audio plays, Rassilon developed the power of regeneration from the Vampires, who were apparently peaceful until the Time Lords attacked them.

He eventually tracks down Rassilon in that universe, and discovers that he has been manipulating an entity called the Kro'Ka to observe and control the Doctor and Charley's actions.

Rassilon's next audio appearance comes in Desperate Measures, concluding the ninth series of Big Finish Productions spin-off Gallifrey.

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.

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.