One of my fav episodes and something i will rewatch. Its great fun seeing Gaius act mischievely when he is possessed by the goblin & i enjoyed seeing all the characters get embarrassed in different ways by the naughty goblin. Its a filler episode but one a fan should not miss. I dont want to give away too much of the plot but we get too see how bad Gaius would be if he was greedy tricky amoral person. Ironically Merlin & Morgana are two characters who usually drive the show dont get to have much fun in this episode. Merlin saves the day as usual but he was the one who started the trouble in the first place.