Name: Sailor Venus to Zoisite ga Kyouryoku? [Sailor Venus and Zoisite are Working Together?]
Original Air Date: June 12, 2004
Director: Nobuhiro Suzumura
Writer: Yasuko Kobayashi

Important Plot Points:

Mamoru's first transformation to Prince Endymion for a battle

Mamoru tells Usagi that Aino Minako is Sailor Venus