The Pilot episode of Invader Zim 

Hoping never to see him again, The Almighty Tallest send Zim on a "mission" to far off Earth. 

Zim makes use of his robot parents at the school's parent-teacher conferences. 

Zim updates GIR's guidance chip, which he tests out in the big city. Unfortunately, GIR has removed the chip, leaving the duo stranded. 

Zim adopts an annoying best friend in order to appear more human. 

Dib sneaks into Zim's base, taking pictures and putting them on a floppy disk. Hoping to erase Dib's memory of where he hid the disk, Zim shrinks down and enters Dib's body. 

After watching a B-war movie, Zim becomes germophobic and dedicates his life to exterminating Earth's bacteria. 

Zim harvests the organs of the school children to appear more human. 

A group of true believers steals Zim's ship and, after catching Zim trying to recover it, begin to worship him. 

Zim searches for a water-proof paste to shade his water allergies so he can survive a water war with Dib. 

It's career day at school and Dib has been paired with a paranormal investigator. However, after discovering Zim is molting due to an equinox, Dib tries to convince his mentor to help him destroy Zim forever. 

Trying to get a permission slip signed, Dib must endure trials (including a parody of the Thunderdome) to gain access to his father. One of three episodes not to feature Zim. 

Zim attempts to stop two planet thieves who intend to burn the Earth in their sun for fuel, therefore ending his mission. 

Zim sends a series of rubber piggies back into the past to stop Dib from meddling with his plans in the future, but the piggies end up causing trouble for Zim. 

Zim uses his hypnotic pimple to force Dib into revealing a weakness in Zim's base. 

GIR's brain takes over the base's operating system, and uses it to travel to the local taco restaurant. 

Zim hijacks a school bus and sends it into a wormhole, at the end of which lies a very large moose. 

Zim turns the class pet into a Godzilla-like creature in order to kill everyone in the city, but must team up with Dib when the giant hamster attacks his base. 

Zim discovers that aliens who look like babies are living on Earth. When they decide to take Zim's ship to return to their homeworld, Zim must fend off the attack of "Giganto-Baby." 

After Dib is kidnapped by Zim, Gaz goes to save him in time for family dinner at her favorite restaurant. 

Zim utilizes virtual torture and destruction in order to sell candy bars for the school fund raiser. 

Zim sees an FBI warning on a rented video and fears that his mission is threatened unless he returns the video immediately. At the mall, he faces the head of mall security. 

Zim infects Dib with a virus that gradually turns him into meat. Dib manages to infect Zim with his own virus so they must work together to find the cure. 

Gaz is on the trail of a video game fan who took the game console that was rightfully hers. One of three episodes not to feature Zim. 

Zim and Dib discover that two of the planets in the solar system are actually spacecraft created by alien civilizations, and use them to battle each other. 

Dib goes on the TV show Mysterious Mysteries to tell the world the story of Zim. To Dib's surprise, Zim, GIR, and Gaz also appear on the show also to tell their sides of the story. 

Zim and GIR are abducted by aliens as human and dog specimens. Escaping is not difficult, as the aliens have only managed to stop one specimen from escaping in the past. 

Zim is sent to training planet Hobo 13 by The Tallest to take a series of tests and prove he is worthy of new equipment 

Zim uses a robot Dib to capture the real Dib while he attempts to destroy the earth. 

As a result of experiments done by Dib, Zim and Dib are trapped in an alternate universe where the only escape is through Dib's head. 

Dib sets out to disprove the legend of the Chickenfoot, who is actually a man stuck inside a chicken costume. One of three episodes not to feature Zim. 

Zim adjusts GIR's behavior but things go wrong when GIR sees Zim himself as a threat to their mission on Earth. 

A lice hunter comes to the school to investigate an outbreak of headlice. She soon discovers that the only ones who are immune to the infestation are Zim and Ms.Bitters. 

Zim causes a very slow explosion and must put it out before The Tallest call and see his mistake. Originally intended to air alongside Hobo 13. 

Zim simulates Dib's entire life to find out whether or not he threw a muffin at Zim. 

Zim is accidentally shipped a high-powered robot with a cloaking device and he immediately heads off to kill Dib with it. 

A pretty new girl, Tak, joins the class and is instantly beloved by all the other children. Zim thinks she's in love with him until she reveals that she's Irken and has come to destroy Earth to impress the Tallest and take his mission. Intended to be the season finale, it was aired out of order. 

A snowman in the future tells children the story of Zim (referred to as "Zam") and Dib ("Doob")'s battle at Christmas. After the series was canceled, this episode was planned to act as the series finale. 

Dib tries to stop Zim from bringing The Tallest to Earth while The Tallest themselves have to deal with the resistance against Operation Impending Doom 2. Originally intended to be the season 2 premiere, it was long delayed until 2006. 

Dib summons a mystical beast to attack Zim, but the beast is easily distracted. 

Dib manages to get a spy cam into Zim's base, but all he manages to show anyone is Zim eating GIR's waffles. 

A girl gets stuck in Zim's yard, attracting unwanted attention from neighbors, the press and the Earth president. 

Dib downloads his personality into Tak's ship, but the ship soon thinks that he is the real Dib, then Zim reminds the ship that it is Irken and attempts to throw Dib into the city sewage plant. 

The school counselor, Mr. Dwicky, believes Dib when he says that Zim is an alien. The two team up to expose him. 

Dib has to stop Zim from winning the school election. 

Dib uses an ancient spell drive to cast a spell on Gaz that makes everything except food made from pigs taste disgusting. 

Zim's former master from Foodcourtia arrives on Earth to take him back to his sentence of hard labor. 

• The Hobo is the same one from Gaz, Taster of Pork.

• A script for this episode was never completed/written.

• The script for the episode [1]

• A script for this episode was never completed/written.
• The title of this episode is a reference to Them!.

• The final script for this episode has not yet been recovered from Nickelodeon, though it was completed.

• Several designs of this unfinished episode including Almighty Tallest Miyuki and Almighty Tallest Spork can be found at [2]

• A script for this episode was never completed/written.

• A script for this episode was never completed/written due to the title of the first episode of "Jimmy Neutron"

• A script for this episode was to be co written by Rosearik Rikki Simons, but was never completed.