It's a Welsh special on this week's I'll Explain Later as we hop across the border to enjoy two stories that put Wales at the heart of the action - the Ninth Doctor's tense trip to Boomtown, and the Third Doctor's iconic brush with The Green Death.

Email your thoughts and questions to [email protected] or "X" us at @explainlaterpod - and we'll be back next week with another pair of adventures whose breadth and depth are perfectly proportioned for the small screen.

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