Richard Bacon is live in Cardiff from 2:00pm Today on BBC Radio 5 Live - going behind of scenes of some of TV's biggest dramas.
He's at the BBC's new Roath Lock studios which are used to film Doctor Who, Casualty and Holby City, to name a few.
Bacon will also be talking to The Doctor's new assistant - the actress Jenna Louise Coleman... And he'll get onto the wards of Holby General Hospital to meet the cast of Casualty.
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[Source: BBC Radio 5 Live]