In Florida, The Celestian alliance were in Nasa, where Barbie was going to preform the first outer space concert for world peace. As they were exploring the area, Kiki found a squid like experiment and shooter water at them. Lilo said, "Experiment 501 a.k.a Yin, she can squirt water.
As they captured her and placed her in the shed. Barbie and Ken were really upset because The Rockers were stuck in traffic. They needed a new back-up band to preform for their outer space concert. Stitch thought that they would fill in for them. Twilight had just the awnser on how can they preform. She summoned 6 instruments in the air. They were, "The Equestriments". Unlike real ones where you take a while to learn it, they play the instruments from the heart and the instruments will do the rest. They don't count as cheating though. David picked the drums, Kristen picked the tambourine, Frank picked the guitar, Kiki picked the bass, and Betty Ann picked the keytar. Gary decided to sing lead for this. He sang Phineas and The Ferbtones latest hit, "Your not Ferb". They accidentally got discovered by Barbie and Ken. They thought that their perfect. Ken asked, "Do you want to go in space with us?". The Celestian Alliance said, "Yes."
They got into the rocket and went up to space. Lilo was excited to be in space again. Stitch waved to the planet and said, "Me so cute and fluffy." As they looked around the space ship, they saw a disco. Kristen raised her right hand and said, "Generosity, turn us into disco dancers." As of that, they were wearing disco clothes. Betty Ann said, "This should be perfect for the gimmick of our band.". They decided to practice "Disco Minature Golfing Queen." Another Phineas And The Ferbtones hit.
As they were practicing, they winded up in a mysterious dimension with skeletal beings and supernatural stuff.