The Running Man (1987).

[Deckerd]

It might be dated but it's still very enjoyable and as someone pointed out early on, curiously topical.

 

[Turd Ferguson]

Regis Philbin would do in a pinch, too.

Or Pat Sajak in a suprising villainous turn.

Personally, I would LOVE to see Alex Trebek in a villainous role... since he's already pretty pompous and arrogant.

 

[Corran Horn]

I like seeing Arnold and Jim Brown in the same movie, but its b-movie cheap and oddly dated.

RAMA

Holy shit, I never realized Fireball was Jim Brown.