Merlin and Arthur find themselves outnumbered in a bar fight but an enigmatic young man helps them win. The man's name is Gwaine and he risks his own life to protect Arthur but during his act of bravery he is seriously wounded. The Prince decides to take him back to Camelot where he could make a recovery with Gaius' help. Meanwhile, the two thugs they've defeated use sorcery to replace two knights and plot to murder the Prince during the tournament. Merlin finds out the sorcery they're using and foils their plans with Gwaine's help, but Uther exiles him from Camelot for impersonating a knight.