SF Universe has the description for February 21 episode, the currently finale episode of the season, after which the series will be pulled out of the CW schedule.
Watch the series on Thursdays, 9 pm/ET! Even if you tape it and/or (legally!) download it, make sure to watch it while it airs; tell your family, friends and co-workers to do the same; spread the word: Supernatural will not get Lost!