After the corruption of Homer due to the Pibby Glitch Corruption, Lenny Leonard, an employee at Springfield's Nuclear Power Plant, is tardy for work. When Lenny arrives, he is surprised and shows his concern or disbelief by saying, "Uh-oh! " or "Oh no! " Eventually, the corruption infiltrates Mr. Burns's office, where it finds Monty Burns, also known as Mr. Burns, and corrupts him. The corruption then compels Mr. Burns to summon Lenny to his office via the P. A. system, capturing Lenny's attention. Lenny follows the instructions of the now corrupted Mr. Burns and heads to Mr. Burns's office, only to discover Mr. Burns acting strangely in the dark. When the lights finally turn on, it reveals that the darkness has also taken hold of Mr. Burns. Realizing he is cornered, Lenny decides to engage in a rap battle, hoping to verbally confront the corruption. Mr. Burns attempts to outdo Lenny in the battle, but unexpectedly, Lenny succeeds in fully freeing Mr. Burns from the corruption. Upon witnessing this, the corruption decides to bring in the two individuals it had previously corrupted, Homer Simpson and Carl Carlson, to challenge Lenny and the liberated Mr. Burns in order to take control of Lenny and re-corrupt Mr. Burns. However, Lenny and Mr. Burns, being clever and aware of the corruption, manage to evade Homer, Carl, and the corruption shortly after leaving Mr. Burns's office. They escape the power plant building and Springfield, searching for any vehicle to flee the town, which has fallen into despair due to the corruption's relentless wrath. Both Lenny and Mr. Burns acknowledge that there is no return to Springfield given the corruption's violent influence, infecting innocent lives. They understand they will never see their former beloved town, now devastated, again as they make a resolute choice to leave Springfield for their own safety, hoping to save their homes and ultimately put an end to the corruption.