A UFO could be seen in the sky. Inside the four sisters and Rubeus were remarking about the size of Tokyo. They each had a black upside down crescent moon on their forehead. Suddenly a man in robes called Wiseman appeared, and told them to find the rabbit and the silver crystal. He said he was losing patience.

Serena and Darien were on a date. They got out of their boat, and kissed each other. Darien didn't notice when a ball that resembled Luna hit him in the head.

Suddenly a pink-haired girl appeared from a cloud in the sky and fell on top of Serena, interrupting their kiss. The little girl apologized to Darien for landing on him, and Serena demanded to know what she was doing and why she had her hairstyle.

The little girl turned around and gave Serena a very mean look. She told her it was her mom's hair style and demanded the silver crystal. Serena couldn't believe it, and asked where she was from.

Impatiently, the little girl told her she had other ways of getting what she wanted. So the little girl jumped up into the cloud again (useing reverse animation), and disappeared.

Serena went home after a discussion with Darien about the little girl. Darien hadn't been sure where she was from, but suggested she was from Serena's past in the Moon Kingdom. Serena was very surprised when she found her room a mess and the same little girl at her house.

Sammy was annoyed that Serena didn't remember her cousin Reeny. He gave her pictures of Reeny visiting them during winter, but Serena didn't remember any of it. Later, Serena reprimanded Luna for sleeping while Reeny had trashed her bedroom while looking for the silver crystal. Reeny appeared out of the bath Serena had been taking and demanded the crystal.

Later, Serena gave the pictures of Reeny to Raye. Raye tried to find out what the pictures were about with her fire but didn't find anything. She told Serena the pictures were fakes. Meanwhile,

Reeny was listening in on their conversation. She decided that she didn't want them all teamed up against her, so she used her kitty magic and put sleeping milk in their tea. All the Scouts fell a sleep, except for Serena, who had been too busy eating to drink. Reeny, who hadn't noticed Serena, entered the room and Serena grabbed her. She realized what Reeny had done and was about to spank her when Reeny screamed. A crescent moon appeared on her forehead, and a huge burst of energy was released.

A long way away Catsy, one of the four sisters who happens to wear an ugly purple toto, noticed the burst of energy. She followed it.

Reeny had stopped crying. Suddenly Catsy arrived, and demanded Reeny. Serena asked who she was, and Catsy replied she was from the far side of the Nega Moon. She attacked Serena with blue fire, but Serena ducked and told Reeny to run. Serena quickly put out the flames burning up Raye's comic books.

Reeny ran out the door, followed closely by Catsy. Catsy attacked Reeny until she was unconscious, and was about to take her when Sailor Moon appeared (for some reason when she transformed she said "Moon Star Power"). Sailor Moon and Catsy fought, and Tuxedo Mask appeared and distracted Catsy.

Sailor Moon used her "Moon Scepter Elimination" attack on Catsy, but she jumped out of the way. Before teleporting, she told Sailor Moon she'd be back.

Tuxedo Mask started having strange images of a town with many crystal-like buildings. Sailor Moon asked him if he knew Reeny, and he replied she was familiar.

In the next episode Reeny ran off, and Darien and Serena had to find her. They took back to Serena's house, but her parents didn't remember Reeny. Quickly, Reeny used kitty magic to hypnotize her family into believing she was their cousin. Serena was almost hypnotized, but Luna bit Serena's hand so she wouldn't believe Reeny. Serena tried to convince her family Reeny wasn't her cousin, but they didn't believe her.

Later Darien had a vision that Serena was in danger. He decided that being close to Serena might put her in danger, so he broke up with her. Serena couldn't believe it.

Rubeus instructed the four sisters to take over important crystal points with dark energy. In the future, the crystal points would be an important part of Crystal Tokyo. The four sisters sent out a droid to capture the crystal point, but the droid was always destroyed by the Sailor Scouts.

Meanwhile, Reeny had tried to return to the future useing a key she wore hidden around her neck. She'd tried to use her crystal key to get home, but only succeeded in causing the gravity to leave in a building. She also talked to a distorted figure in her luna ball, who told her she had to stay in the past.

Wiseman grew annoyed at Rubeus for his continued failures, and instructed him to destroy the Sailor Scouts. He explained that those Female Warriors were causing him a great deal of trouble in the future because they were protecting Crystal Tokyo with a strong energy force field. Wiseman told him that the rabbit (Reeny) would appear on a bridge in the past, and later the crystal would too. He disappeared, and Rubeus remarked that the sisters would like the assignment.

Reeny wanted to go home. She felt lonely because she'd tried to sleep in Serena's bed, and Serena had yelled at her. Reeny thought of her mother, and remembered how much she loved her. She left Serena's house and went up some stairs. Then she remembered a mysterious voice telling her that her key would let her travel in time, but it was dangerous if used too often. Reeny (in the present) said she didn't care, and stood up yelling "Crystal Key... take me home!"

A cloud appeared above her head, and she started lifting to the sky. Reeny smiled that she was going home.

But suddenly the cloud disappeared and Reeny fell to the ground. She cried and a crescent moon appeared on her forehead. A huge beam of energy erupted from her crescent moon as she yelled for her mother and father.

Eventually she stopped crying. Catsy and Birdie were walking up the steps toward her. Reeny cried for help, and luna ball attacked Birdie while Luna attacked Catsy. Luna was badly hurt, but Reeny ran away.

Serena noticed Reeny duck into an alley and followed her. Reeny sat down near a construction area, and started talking to her luna ball again. The luna ball told her to trust the Sailor Scouts, and that they were fighting for a better future. Serena listened to the whole thing, and realized that Reeny was from the future.

Catsy arrived. Serena quickly transformed into Sailor Moon, and vowed to protect Reeny. The rest of the four sisters appeared, but so did the Scouts. They battled. Rubeus arrived and attacked Sailor Moon. Sailor Moon didn't give up, surprising Rubeus, and vowed to protect Reeny. Tuxedo Mask appeared, and launched roses at Rubeus, fending off his attack. Rubeus was still recovering from the blast when Sailor Moon used her "Moon Scepter Elimination" attack, and blasted Rubeus. Rubeus, now badly hurt, told the Four Sisters to leave. He left also, saying that he would be back.

Wiseman realized that Sailor Moon was the queen of Crystal Tokyo, and that Reeny was Neo-Queen Serenity's daughter.

In the next episode, Rubeus sent Catsy out on an assignment to capture Reeny at Raye's temple. Catsy was defeated by Sailor Mars, and was about to kill herself when Mars stopped her and convinced her to turn good. Sailor Moon used her Moon Crystal Healing Power to heal Catsy.

After that, Rubeus sent Birdie out to capture a crystal point, a chess tower that Amy was at. Amy transformed into Sailor Mercury, but Birdie left. Later, Birdie and Amy entered a chess tournament, and were facing off together. When Amy defeated Birdie, she grew angry and attacked her. Amy transformed again, when she realized that the chess opponent was Birdie. The other Sailor Scouts arrived, but Birdie captured the Scouts (except for Mercury) in a dome.

Birdie was about to defeat Amy when her sisters Prisma and Avary appeared to claim some of the glory. Suddenly Tuxedo Mask appeared, and broke the globe with a rose. Avary and Prisma deserted Birdie. Birdie was about to kill herself, but Catsy came and begged her to join them. Birdie realized that evil was wrong, and agreed. Sailor Moon used her Moon Crystal Healing Power to heal Birdie.

Wiseman told Rubeus to get Birdie and Catsy back. He gave him a scepter that would reverse all of Sailor Moon's healing, and increase the holder's power ten fold. Rubeus gave the scepter to Prisma.

Prisma and Avary captured Birdie and Catsy, and took them to a bridge. Reeny and the scouts saw them kidnap Birdie and Catsy. Serena took Reeny to another room and they transformed. Reeny left the room and ran back, witnessing each of the scouts transform. She watched Serena transform into Sailor Moon, and couldn't believe it.

The Scouts followed Prisma and Avary to the bridge. Prisma started attacking the Scouts, and none of the their attacks worked on her. Avary encouraged Prisma to blast them, but Prisma blasted Avary, Catsy, and Birdie instead. She told them she was sick of sharing things four-ways.

Avary couldn't believe Prisma had betrayed her, and with some encouragement from recovering Catsy and Birdie, realized that evil was wrong. Prisma started attacking the Scouts again, but Venus used her "Venus Love Chain Encircle" to knock the scepter away. Jupiter used her "Jupiter Thunderclap Zap" to zap her. Catsy asked if Prisma was all right, but Prisma told Catsy not to touch her.

Rubeus appeared and accused her of being a trader, then turned the scepter into a whirlpool of time. Prisma couldn't believe that Rubeus had betrayed her. Catsy and Birdie asked that Prisma join them to fight for good, and Prisma agreed.

The Whirlpool of time grew in size and intensity, and the Sailor Scouts were being pulled in. Tuxedo Mask appeared and encouraged them to pool their powers and destroy it. Artemis agreed, saying that if they let themselves get sucked into the whirlpool they could attack it in the next dimension. With some desperate hesitation by Sailor Moon, they allowed themselves to be sucked into the whirlpool.

In the next dimension, Artemis and Luna instructed them to pool their powers to destroy the scepter. The Sailor Scouts used their new attack, "Sailor Planet Power", and destroyed the staff.

After they returned, Sailor Moon healed Prisma and Avary with "Moon Healing Crystal Power". Reeny, who had caught up with the battle, witnessed her use the silver crystal. She realized that Serena had had the crystal the entire time.