Bleach Episode List -

The Soul Society: The Sneak Entry & The Rescue Arcs (Episodes 21–63)Widely considered one of the greatest arcs in shonen history, Ichigo and his friends invade the Soul Society to save Rukia from execution. This era introduces the Gotei 13 Captains and features legendary battles, such as Ichigo vs. Kenpachi and Ichigo vs. Byakuya. The arc ends with a massive plot twist involving Captain Sosuke Aizen that changes the trajectory of the series forever.

– Rescue Rukia, Part 1