Yes, dth1971 this is a fanfic based off of the second cartoon where they never made it back to Earth. And now that that is answered, without further ado, here is the next chapter.
Chapter 11
"NO!!!!! We can't leave! Everybody listen to me!" Melody shouted. Everybody was shocked into silence by this outburst from the normally mellow Melody. "Stop the engines. I have to talk to you guys." Valerie found herself obeying and cut the power to the engines. "Thank you. Now you have to listen to me. You didn't give me a chance to tell my story before when I was trying to. Now will you listen to me?"
Valerie nodded. "All right, Melody. Go ahead and say what you need to say."
"When I was lost in the castle with Bleep we came upon some guards...Or maybe they weren't guards. Maybe they were cooks or acrobats or---
"MELODY!!!!" This was from everybody.
"O.K. Sorry. Anyway, they were talking about something bad happening to somebody. I think they meant Alexandra. Something bad is going to happen to her and we can't let it."
"What bad thing do you think is going to happen to Alexandra, Melody?"
Josie asked gently.
"I don't know. They said something about a human sacrifice. I think they're going to kill her." She burst into tears.
The others were just staring at her, stunned again. "You can't be serious, right? It's a mistake. You heard wrong," Alexander insisted.
Melody shook her head. "I wish I did, Alex but... I didn't. They said something else about proud and full of themselves sentient beings learning a lesson."
"Well, that describes my sister, all right, but she doesn't deserve to die for it."
Alan agreed. "No, she doesn't. We have to rescue her. The question is—how?" And by instinct, the whole gang turned to the smartest among them—Valerie.