Ep 4. Germs/Dark Harvest

Zim is an alien from the planet Irk, who has been sent to Earth on a mission to conquer it. He is accompanied by his robotic assistant, GIR, and is constantly plotting various schemes to achieve his goal. In the fourth episode of the first season, titled "Germs/Dark Harvest," Zim must deal with a new threat to his mission: his own incompetence.

The episode begins with Zim discovering a new weapon in his arsenal of technology: a germ-inducing gun. He plans to use this weapon to infect the humans with a deadly virus, weakening their defenses and allowing him to conquer the planet with ease. However, Zim soon realizes that he is not immune to the virus himself, and he becomes obsessed with avoiding it at all costs.

Meanwhile, Zim's human classmate, Dib, has discovered Zim's true identity as an alien invader and is eager to expose him to the world. He is particularly interested in Zim's unusual fascination with human organs and begins to suspect that Zim is harvesting them for some nefarious purpose.

Dib's suspicions are confirmed when he sneaks into Zim's laboratory and discovers a collection of human organs, including a brain, a spleen, and a kidney. He alerts the authorities, who launch an investigation into Zim's activities. Zim, however, is more concerned with avoiding the deadly virus than with the investigation, and he goes to great lengths to protect himself from exposure.

As the investigation heats up, Zim becomes increasingly desperate to protect himself from the virus. He dons a biohazard suit and begins to isolate himself from the rest of the world, living in a sealed chamber in his laboratory. In his isolation, he becomes increasingly paranoid and delusional, convinced that the virus is a sentient being that is out to get him.

Meanwhile, Dib continues to gather evidence against Zim, culminating in a confrontation at the school science fair. Zim, who has finally succumbed to the virus, is weakened and delirious. Dib takes advantage of this opportunity to reveal Zim's true nature to the world, but is ultimately thwarted by GIR, who uses a powerful laser to destroy the evidence and protect Zim's secret.

In the end, Zim narrowly avoids being discovered by the authorities, but is left humiliated and weakened by his own incompetence. The episode ends with Zim vowing to be more careful in the future, while Dib continues to plot his next move against the alien invader.