Dark Mercury first appeared in Act 21 after Ami was kidnapped and brainwashed by Kunzite, She's shows dishonor to everyone in the Dark Kingdom including Kunzite who kept trying to hit on her. But she shows Kindness to Nephrite, When she appears his cape, In Act 25 Akumi greets Sailor Moon and transforms in Dark Mercury and battles along with Kunzite during the fight Kunzite knocks Sailor Moon down with a strong final blow, Dark Mercury angrily tells Kunzite that Sailor Moon was her Prey, But Kunzite told her that " Today is Different" and waves his sword at Sailor Moon preparing to attack her until Tuxedo Mask jumps in and saves Sailor Moon by taking the attack himself which causes Sailor Moon to break down and cries as Kunzite and Dark Mercury argue with eachother Sailor Moon transforms i