Gesen’s name is a pun on the Japanese term ゲーセン Gesen, the short form of ゲームセンター gemu senta, which means “game center.”
Sailor Moon's Moon Healing Escalation
In episode 25, Zoisite extracts the red Rainbow Crystal from him and turns him into Gesen, champion of the Dark Kingdom. His attacks included turning his hand into a mallet or extending a claw (similar to a game machine crane) from his hand. When Makoto Kino threw Gesen down, the mark of Jupiter appeared on her forehead. Luna gave her the power to transform into Sailor Jupiter, who disconnected Gesen's circuits with her Supreme Thunder. As he was getting back up, Luna gave Sailor Moon the power to use Moon Healing Escalation, which she used to heal Joe, returning him to normal and destroying the Shadow within him.