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Merlin star says there's a big episode on the way

14 December 2012 Last updated at 08:40 GMT

Alexander Vlahos, who plays Mordred in Merlin, says there's a big turning point for his character before the end of the show.

The BBC has confirmed the series will end this month after five years.

The 24-year-old says there are lots of theories online about what will happen, but all he can say is that the final few episodes are "big" for him and some of the others characters.

The next episode of Merlin is on BBC One at 8.15pm on Saturday 15 December.

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