Jimmy finds something that wasn't there last time, and asks Carl to scratch a sample of some human body-like part to get DNA samples as Jimmy was too nervous to do it. When Carl uses a knife on it, the body-like thing starts to move and spits out a scorpion-shaped alien which spreades all over Carl's face.
Carl turns around with a Creature like thing on his face.
Jimmy, Carl and Sheen then go back down into Jimmy's lab to detect and remove what the scorpion-like thing was, When Carl gets up, Jimmy and Sheen realize that Carl's butt is turning purple and a pink thing glowing in it. He then uses his gadgets and inventions to figure out what the glowing object in Carl's butt is. After figuring it out, Jimmy realizes that Carl has become pregnant with a baby alien after having that scorpion-like thing on his mouth.
Going to Carl's house, Jimmy asks Carl's dad if he could borrow Carl for a moment, but they were busy chatting about how cool it would be having a grandchild. Jimmy gets frustrated,
Sheen tries to help Carl out by feeding him some more weird foods while Jimmy tries to come up with a cure. Carl then goes to Cindy's house to have help with this new baby alien he will about to give birth to The scene goes back to Sheen being with Carl and when Carl hears that his baby is ready to be born, he goes outside and when Jimmy is about to try and stop the giant alien, Carl comes and tells him he knows what the alien wants. Carl then somehow releases the baby who looks just like the giant alien jellyfish, and is revealed to be called Shmengo. The two then fly off to their homeplanet while Carl says goodbye and hugs him.
One month later, Jimmy, Carl and Sheen go back to the planet to visit and celebrate Shmango's birthday, who has revealed to have two unnamed siblings and a mom were at his first birthday. Carl and Sheen hug Shmengo and become shocked by electricity, making Jimmy not want to even have a hug
