Seiyuu: Tohru Furuya
The Moonlight Knight (Tsukikage no Knight) was an alter-ego of Mamoru Chiba. After Sailor Moon defeated the Dark Kingdom once and for all in episode 046, the Senshi and Tuxedo Kamen were killed. Sailor Moon wished for everyone to be reincarnated on Earth to live out their lives like normal, and so they were. Everyone returned to Earth, but their memories of their lives as Senshi had been erased. When the enemies Ail, An, and the Makaiju arrived on Earth, Luna and Artemis were forced to reawaken the Senshi, allowing them to transform again to fight evil. However, they were unable to restore Mamoru's memories, so he had no recollection of his past working with Sailor Moon.
Soon after the Senshi were reuinted, a mysterious man in Arabic-style white clothing began assisting them. He called himself the Moonlight Knight, and looked, sounded, and acted very much like Tuxedo Kamen. Sailor Moon initially thought that the Moonlight Knight was Tuxedo Kamen, due to their similarities. But her belief was called into question in episode 050, when both Mamoru and Moonlight Knight appeared in the same room at the same time.