Cant go wrong with Alda as a star. sadly I read he isn't doing well.
Parkinson's bad. He was enough of a Trooper to play a shrink with it in "Ray Donovan" TV series.
I don't think anyone can cure cancer. And as far as the possibility of stopping asteroids, I'll.believe that when it actually happens. There have been many proposed strategies for stopping asteroids, but none of them have been tested yet.