Name: Luna ga Sailor Senshi ni Nacchatta! [Luna Became a Sailor Senshi!]
Original Air Date: April 17, 2004
Director: Kenzo Maihara
Writer: Yasuko Kobayashi

Important Plot Points:

Sailor Luna's introduction

First Appearance of the Lunatia L

Luna uses "Luna Prism Power, Make Up!" for the first time

Sailor Mercury overcomes the spell put on her