Moon Prism Power

Moon Prism Power is a transformation phrase used by both Serena Tsukino and Rini to transform into Sailor Moon and Sailor Mini Moon respectively. Once this phrase is shouted, their transformation locket is activated and it gives them the ability to become Sailor Scouts.

Trivia
The theme for this transformation was used only in "A Moon Star is Born". All subsequent episodes used the theme for "Moon Crystal Power".