Cameron plays a young boy in Victorian times and he has a scene with his screen parents and other children.
His character as an adult is played by a well-known actor, but to say whom it is would be to give away too much of the plot.
Cameron’s mother had to sign a declaration of confidentiality about divulging details of the plot.
Although he did not get to appear with The Doctor himself – Matt Smith – Cameron and his mother shared a taxi back to Cardiff with Neve McIntosh, who plays Madame Vastra.
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