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Originally aired in the UK on BBC1, NBC offers up this period drama about the fantastic world of Merlin as a young man.

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MERLIN ''The Crystal Cave'' Review Season 3. Episode 5
MERLIN ''The Crystal Cave'' Review Season 3. Episode 5
MERLIN ''The Crystal Cave'' Season 3 Episode 5 - Preview
MERLIN ''The Crystal Cave'' Season 3 Episode 5 - Preview