I've always been a big fan of time travel and I'm very into the notion that some day we'll be able to do it. Beam me up!
I've always had an affinity for lawyers. My dad is a lawyer. He's retired now. My brother is a lawyer.
You want to try and bring a character to life in an honest a way as you possibly can. It doesn't matter whether he's a doctor an actor a car salesman or a captain of a starship. If you can bring truth and honesty to that character then your audience will believe you.