Companion (Doctor Who) "Face the Raven", but in a subsequent episode ("Hell Bent") her time stream is frozen at the moment of death by the Time Lords so that they can interrogate her about the Hybrid; the Doctor takes advantage of this to save her life, but she remains technically neither alive nor dead, does not age or have a pulse. After her departure as a companion of the Twelfth Doctor, she teams with the immortal Ashildr and travels in a stolen TARDIS. Other companions died in alternate timelines or alternate lives. "Brigade Leader" Alistair Lethbridge-Stewart, "Section Leader" Liz Shaw, and "Platoon Leader"
The Crystal of Cantus Doctor Who audio adventure "Sword of Orion". It's suggested that the creature is still trapped inside Irving Braxiatel's head which may explain his behaviour. The story features the culmination of events leading back to "The Mirror Effect". It's implied that the Crystal of Cantus is actually from the Coronet of Rassilon. The Crystal of Cantus The Crystal of Cantus is a Big Finish Productions audio drama featuring Lisa Bowerman as Bernice Summerfield, a character from the spin-off media based on the long-running British science fiction television series "Doctor Who". Bernice, Jason and Irving Braxiatel visit the planet of Cantus to