Just in case anyone wants to check it out, The Hitch-Hiker was actually a radio play that was performed at least three times before it reached television. All three times Orson Welles played the lead.
If you want to download one of those adaptations and listen to it (perfectly legitimate, it's public domain now) you can check it out
HERE.
I have a fondness for old radio shows, and this epsiode is pretty good.