Dark Knight

Season 1, Episode 6: Spellbound

Select Source

Odo's misspent youth resurfaces when he returns to his roots to purloin a very special book that provides him with the opportunity of a little "further education". The ex-sorcerer's apprentice decides to put his training into practice, with chaotic results! Ivanhoe loses his heart, and Odo loses his grip when he opens the fatal Book of Spells.