R1
After the Holy Empire of Britannia conquers Japan and renames it Area 11, a Britannian student named Lelouch Lamperouge gains the "Power of Kings" called Geass from a girl named C.C. Lelouch uses his newfound power to become Zero, a masked vigilante leading a rebellion against Britannia to seek revenge.
All Episodes
S1 E1: The Day a New Demon was Born
S1 E2: The White Knight Awakens
S1 E3: The False Classmate
S1 E4: His Name is Zero
S1 E5: The Princess and the Witch
S1 E6: The Stolen Mask
S1 E7: Attack Cornelia
S1 E8: The Black Knights
S1 E9: Refrain
S1 E10: Guren Dances
S1 E11: Battle for Narita
S1 E12: The Messenger from Kyoto
S1 E13: Shirley at Gunpoint
S1 E14: Geass vs. Geass
S1 E15: Cheering Mao
S1 E16: Nunnally Held Hostage
S1 E17: Knight
S1 E18: I Order you, Suzaku Kururugi
S1 E19: Island of the Gods
S1 E20: Battle for Kyushu
S1 E21: The School Festival Declaration
S1 E22: Bloodstained Euphy
S1 E23: At Least with Sorrow
S1 E24: The Collapsing Stage
S1 E25: Zero