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.

Plot
Bernice, Jason and Irving Braxiatel visit the planet of Cantus to locate its fabled Crystal. There, they unearth what seems to be a tomb of Cybermen. When even that isn't what it first appears to be, Bernice discovers that she can no longer trust one of her oldest friends.

Cast

 * Bernice Summerfield — Lisa Bowerman
 * Jason Kane — Stephen Fewell
 * Ronan McGinley — Nicholas Briggs
 * Irving Braxiatel — Miles Richardson
 * Joseph — Steven Wickham
 * Peter Summerfield — Thomas Grant
 * Parasiel — Paul Bryant
 * Commander Hallan — Michael Cuckson
 * Babs — Katarina Olsson
 * Jack — Toby Longworth
 * Thesanius — Gary Russell
 * Cassus — Joseph Lidster

Trivia
This story features a return to the Garazone Bazaar, first heard in the Doctor Who audio adventure Sword of Orion.

It's suggested that the Pandora 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.