Deep Geeking: This week, Tim and Summer talk about "Epiphanies", a pivotal episode where alliances, plans and perspectives shift for a number of people. Garibaldi leaves his post as security chief, pushing Zack into an unexpected new role; Bester comes to B5 looking for Sheridan's help in exploring what the Shadows might have left behind on Z'ha'dum; Lyta begins to test the extent of her Vorlon-enhanced powers at Sheridan's request.