Molly (guest Tricia Helfer)and her husband are driving along a long deserted highway at night when they come upon a farmer. The next thing Molly knows both the husband and the farmer have disappeared. Things get worse when the Winchesters inform Molly that the farmer is actually a highway ghost who appears annually to claim a new victim, who happens to be Molly this time.
It'll be good to see Tricia in another show - especially one such as Supernatural, a personal favorite of mine. Supernatural, in case you're not familiar with it, is about two bothers who travel around the country, seeking out various demons and monsters and killing them to save people. It's currently in it's second season, and while not the best show on TV, it's certainly fun and has a nice blend of humor and horror. Think the Hardy Boys meets Buffy the Vampire Slayer, but better. Supernatural airs on the CW at 9 pm.
EDIT: Apparently this won't be on tomorrow night, but March 15th.