Bertram was the name given to a rogue Viyran by Charlotte Pollard. (AUDIO: Embankment Station)

Bertram spoke differently to the other members of his species and was light on his feet. (AUDIO: The Lamentation Cipher)

He told Charlotte Pollard that the Viyrans didn't know much about the Ever-and-Ever Prolixity. He knew of the Lamentation Cipher. (AUDIO: The Lamentation Cipher)

He infected Charley with a virus that would reboot the Viyrans. He allowed her to escape so it would incubate in her and make it more virulent. (AUDIO: The Viyran Solution)

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