"We shall abduct the young former human's first younger sibling."

Bart, who was too shocked by his new appearance to say a word up until now, suddenly snapped back to reality and yelled :

"You're going to capture Lisa ?! Oh no, please don't do this ! Continue to change me instead !
-Calm down, we have no intention of harming her. We only wish to experiment on her. We promise to let you both go when we're done !
-Like I'm gonna believe aliens like you ! I don't care if you don't change me back, just don't kidnap my sister !

This time, the aliens did not respond. They shot a beam of light down to the Simpsons' house, and Lisa suddenly materialized inside one of the UFO's teleportation tubes, still asleep. Bart realized that this is how they had kidnapped him earlier.

The aliens opened the teleportation tube, grabbed Lisa, and placed her onto what looked like an operating table, before strapping her to it. She woke up and tried to rub her eyes, but realized she was restrained. She also saw the aliens, including her transformed brother. She screamed, and Bart tried to explain the situation to his sister.

"Lisa, it's me, Bart ! I look like an alien, but that's because they transformed me into one !
-You're not fooling me, you slimy octopus ! Now let me go !
-But it's true, Lis, I'm Bart ! You have to believe me !
-It is true, young female human."

Bart was surprised to see the aliens actually helping him explain the situation to Lisa.

"We have already abducted your older brother, and tested one of our new potions on him, making him one of us. We have no further use for him, so he shall be turned back, but we shall now test a potion on you."

Lisa couldn't believe it. She struggled and tried to escape, but she couldn't get away. Bart tried to run to his sister's help, but because he wasn't ued to his new body, he tripped and fell down. Kodos grabbed him and managed to drag him out of the room, while he kept on screaming Lisa's name. Kang said :

"Good. Now then, shall we start ?"

He picked up a syringe from a nearby table, and injected its contents into Lisa's arm. He watched, with a devilish smile on his alien face, as his other young captive was...