"In case people don’t know, a ‘closed set’ is what happens if something sensitive is being shot, like a top-secret plot development, or an actor doing a nude scene. It means that nobody is allowed on the set except the people who are absolutely essential: the director, the camera crew, and so on. No unnecessary spectators. So, naturally, Joe told everyone that it would be a closed set for Captain Jack getting naked in front of the Trine-E and Zu-Zana robots. We’d just finished shooting a different scene, so we were all making our way off the set, back to our trailers, and just as we were all heading off, John Barrowman appeared at the studio entrance in his dressing gown. And he said, ‘Listen everyone, you do understand it’s a closed set because there’s going to be some nudity?’ And we all said, ‘Yes, don’t worry John, we’re all just going off for a cup of tea.’ And at that point John took off his dressing gown and walked all the way across the studio completely stark naked, in front of all of us, keeping a straight face and saying very solemnly, ‘Now, it’s a closed set, everybody, I don’t want anyone peeking through the curtains!’ Anther triumph for the famously shy and retiring John Barrowman there."