The Celestian Alliance were playing hide and seek in Central Park. Lilo and Stitch were it. Stitch sniffed out all of them, except Sara. When they found her by a bush, they found an experiment. Lilo said, "Sara, you found Experiment 234 a.k.a Shush, she can hear private conversations." Puss said, "A Microphone experiment." Sara and Lou snuggled her.
Back on the ship, Juumba was working on a teleporting experiment where he can teleport experiments to RBTV while they look for the other experiments. To activate the machine they must teleport a group or person. He Chose The Celestian Alliance and the location. Jumba thought of a planet. He accidentally said, "51". while answering Pleakely how many people can it teleport at once. They accidentally activated the teleportation invention and teleport The Celestian Alliance to Planet a planet based off of the 1950s named, "Planet 51". They met a green alien who's going to his job. Donkey, Puss, Stella and her friends looked around while The rest of The Celestian Alliance went with him.
Lilo said, "Excuse me, we somehow got on this planet and I wonder if you can help us." The alien freaked out and said, "You can't be seen in here, your humans." "I'm Lem". "Hi Lem." "But first we need to get you out of those clothes. He changed them into 50s outfits. Rarity said, "Wow, you guys look fabulous." Lem said, "Come on we need to get you off this planet fast."
As he sneaked out with the team, he met his 2 good friends, "Skiff" and "Eckle" Eckle said, "Are those humans?" Lem said, "Yes, but we don't want anyone to freak, because General Grawl thinks humans are bad and they might take over our planet." Lem explained that everything will be okay as long as they don't get caught by his people.
