X-Files: Drive. Mulder is taken hostage by a desperate man who has to keep moving west at increasingly high speeds - or his head will explode. This is a cracking episode with a killer premise and some fantastic sequences (the whole scene at the guy's farm with Scully and the CDC team is wonderfully atmospheric. And I love Scully getting to know how Mulder feels when she proposes to the CDC guy, "What if we're not looking for a virus? What if what we're looking for is a sound?" The guy just looks at her and goes, "Seriously?"
