What episode does rukia see ichigos bankai for the first time?

Rukia first sees Ichigo's Bankai in Episode 220 of "Bleach," titled "The Blade's Journey." In this episode, Ichigo battles against the powerful Espada, Ulquiorra Cifer, and showcases his Bankai, Tensa Zangetsu. Rukia's reaction to Ichigo's transformation highlights her admiration and recognition of his growth as a Soul Reaper.