Kit Harington has gone from blood and gore in "Game of Thrones" to blood and gore in an English Elizabethan drama. The actor, who played Jon Snow in HBO's fantasy series, plays the title role in a West End production of Christopher Marlowe's "Dr. Faustus." The production, which opened Monday, has plenty of crossover appeal for "Thrones" fans, from scenes of sex, violence and debauchery to long stretches featuring Harington clad only in his underpants.