If you were looking for the British fantasy series Merlin (Season 3, Episode 5), that episode is titled " The Crystal Cave " and focuses on Merlin seeing a vision of Morgana killing Uther.
Merlí makes a pointed comment regarding Oksana as a mother, which strikes a deep nerve and causes tension. MerlГ 3x5
Inspired by the classroom debate on forgiveness, Pol Rubio is spurred to make amends for a past misdeed he committed. If you were looking for the British fantasy
I can provide more about their arc in this episode. MerlГ 3x5