Which player who showed as the third goalie in a game has the biggest weight? Give the full name of the player.
the third goalie refers to stint = 3; the biggest weight refers to max(weight)
SELECT T1.firstName, T1.lastName FROM Master AS T1 INNER JOIN Goalies AS T2 ON T1.playerID = T2.playerID WHERE T2.stint = 3 ORDER BY T1.weight DESC LIMIT 1