Fantasy Casting: Next Gen

John: Hey, Chris, I was just asking Frakes what he thought of Trek.

Frakes: I loved it.  Had a great time.

Chris:  Of course, all you have to worry about now is Zach Efron playing you in the Next Generation prequel.

John: ...

Chris: Go ahead.  Blog it.

I'm rewriting all morning.  Fantasy-cast away in the comments, with DS9 also allowed.