Babylon 5: Season 4, Episode 9

4 - 9: Atonement

When her clan questions her reason for taking Sheridan as a mate, Delenn is summoned back to Minbar to undergo a ritual that draws out memories of her past, where she uncovers a surprising Minbari secret. Meanwhile, Sheridan sends Marcus and Franklin to Mars to make contact with the Mars Resistance in hopes they will aid Babylon 5's resistance against President Clark.