Sailor Pluto made her appearance when Sailor Moon, Venus and Tuxedo Kamen where looking for Chibi Usa in a dark void. When they came upon the doors to the future Sailor Pluto attacked Sailor Moon with her Dead Scream, explaining that it is forbidden to be near the time doors or even know about them. Though after Luna, and the others identified the girl Sailor Pluto attacked was Sailor Moon, she said "Sailor Moon," Sailor Pluto says. "No matter who you are, I cannot allow you to break the law. My mission must be to destroy you." Sailor Pluto was about to attack Sailor Moon again until Chibi Usa appeared and stopped her from attacking. Chibi Usa explained why she brought others knowing it was against the rules to do so, she also told Sailor Pluto that the Silver Crystal could help the future. Though Pluto told Chibi Usa that the crystal's power is the same in any time and place. She also confronted Chibi Usa about stealing the small time key and going into the past with no permission, and identified Chibi Usa as 'Princess', shocking the others. Sailor Pluto opened the doors and told the others that she cannot follow because its her duty to guard the doors of time. Later Minako asked King Endymion about Sailor Pluto's existence, here is his explanation: "Sailor Pluto's mission and situation are entirely different from that of Princess Selenity's four guardian soldiers. She carries the blood of the god in charge of time, Cronos. She lives between time, the solitary guardian of the door of the underworld. Time is the last inviolable territory. Since ages ago, the space-time door has been off-limits, and Sailor Pluto was the one who enforced that." In the midst of other events Chibi Usa disappears in the time void with out the time key, in a panic Tuxedo Kamen goes after her with out a key despite Pluto's warnings about how expansive the void can be and how one can get lost. Several emergencies also happen that involved Sailor Pluto acting as an informant of coming danger, over all with this type of situation she wants to help but is restricted in her abilities, until a moment in this series caused her to break the rules Queen Selenity enforced. "Pluto," Queen Selenity says. "You watch the space-time door. You are the soldier who controls time and space. There are three things you must not do. First, you may not cross time. Second, you can never leave the door you must protect. And the third thing you must not do: You mustn't stop time. You and the garnet rod you carry are endowed with the power to move time. But no matter what happens, you must never stop time. If you ever violate that law... You will give up your life." The situation got worse, Chibi Usa became Black Lady and she took Sailor Moon's Silver Crystal. Diana offered to stand guard at the time doors so Pluto can help fight the Black Moon. Prince Diamaund took both crystals of the past and future and was going to let them touch, Pluto informed everyone that the world would not exist if that happened. The Scouts and cats took cover while Black Lady tried to stop Prince Diamaund, but Sailor Pluto rose her staff and shouted "Stop! Time Stop!" After that everything but the Sailor Scouts, the King, Tuxedo Kamen, and Black Lady was frozen. After realizing that Pluto sacrificed her life to save the others, Black Lady turned back into Chibi Usa, then transformed into Sailor Chibi Moon. Soon time begin to run and Sailor Pluto died. (The most heart wrenching part of this Manga).