Sometimes you work all the way through to 5am, then get a few hours and you're back on set again.

The main prank that we play with props is for people's birthdays. The special effects people will put a little explosive in the cake so it blows up in their face - that's always fun to play on a guest star, or one of the trainees or someone who's new.

The best part? Probably being able to portray such a respectable, ethical, intelligent, strong woman. That's still pretty rare in our business, unfortunately.

Catherine Bell Quotes