Lisa accidentally splits Lincoln in two halves.
Lisa is testing her new machine that divides in halves, quarters, etc. She tests it putting an apple in a nearby table to cut it in two. But Lincoln passes behind in the hallway, and Lisa had the door open. So when she activated the machine, the ray went to Lincoln, splitting him in two halves. At first Lincoln didn't noticed that, only noticed it when he standed at school. His upper part slipped from his legs, that went away running. After school finished, Lincoln needs a way to return home, because he doesn't has legs for now. First he tries to use a pair of skates, but that failed because he needed the arms to balance himself. Later he tried walking (or better said 'arming'). Actually, that worked quite well, as he arrived to the house in a pair of minutes. He climbed up the stairs to Lisa's room, and he said that her machine caused that his legs ran away. Both start a quest to find Lincoln's legs. So Lisa puts half-Lincoln in a cart, and started to search in the city. Both finally find them near the dump yard, fortunately were trapped in a corner, so Lisa could grab them and take them to home. Already there, Lincoln was reclined in a chair, holding his legs in the correct position. Lisa shoot him an antidote ray to join again his legs to his body, but Lincoln didn't remove his hands at time, and remained stuck to his legs until the next episode.