Who played the role of a teleplay in the episode that won "Best Television Episode"?
the role of a teleplay refers to role = 'teleplay'; won refers to result = 'Winner'; "Best Television Episode" refers to award = 'Best Television Episode'
SELECT T2.name FROM Award AS T1 INNER JOIN Person AS T2 ON T1.person_id = T2.person_id WHERE T1.result = 'Winner' AND T1.award = 'Best Television Episode'