第 3 季 共 14 集
播出时间：1999年10月3日
第 1 集 The Worm-Guy Guy Syndrome
播出时间：1999年10月3日
Two Kalifadik law enforcement officials begin punishing the guilty on Earth, using teleportation guns to send them to an alien prison. As MIB tries to stop them, Jay and one of the worms pass through each in mid-teleportation and slowly turn into each other.
第 2 集 The Cold Sweat Syndrome
播出时间：1999年10月10日
Merged together, Alpha and Dak find themselves in Antartica where a powerful alien spaceship lies buried.
第 3 集 The Puppy Love Syndrome
播出时间：1999年10月24日
Frank the Pug meets an alien named Veronica and falls in love. But what he doesn't know is that Veronica works for Javkor, who is out to steal MIB's most powerful weapons.
第 4 集 The Lost Continent Syndrome
播出时间：1999年11月7日
Jay and Kay have to stop alien terrorist Quintoon's plans to raise the legendary Atlantis continent.
第 5 集 The Way Out West Syndrome
播出时间：1999年11月14日
When MIB fails to stop a Metaphite that threatens Phoenix, Jay and Kay have to travel back in time to the wild west to find the Metaphite's then vulnerable cocoon.
第 6 集 The Mine, Mine, Mine Syndrome
播出时间：1999年11月21日
The Bug Queen herself has come to Earth and is hiding in hotel, waiting for her eggs to be able to take over. Making things worse for MIB is the presence of the Emperor Worm, who happens to be staying in the exact same hotel as the Bugs.
第 7 集 The Bye-Bye Worm Syndrome
播出时间：1999年12月5日
When Zed orders the worms to be sent back to their home after another mishap, Jay does whatever he can to prove their innocence.
第 8 集 The Lights Out Syndrome
播出时间：2000年1月16日
Kay is blinded by a Darkon ray and will need Jay's help to stop the Darkons from creating a permanent eclipse.
第 9 集 The Out To Pasture Syndrome
播出时间：2000年1月23日
Zed surprises everyone when he decides it's time to retire. Jay gets partnered with Elle since Kay is chosen to be the new head of MIB. As Zed is neuralized and embarks on a life of fishing in Long Island, Alpha returns more powerful than ever.
第 10 集 The Sardines & Ice Cream Syndrome
播出时间：2000年2月6日
Jay accidentally swallows an alien egg and becomes pregnant. Meanwhile, the Fmeks are shrinking everything in sight.
第 11 集 The I Want My Mummy Syndrome
播出时间：2000年3月5日
Jay and Kay have to contend with a recently awakened Hyperian, which is dressed like an ancient Egyptian Mummy.
第 12 集 The Baby Kay Syndrome
播出时间：2000年3月26日
The Stellairian leader comes to Earth for peace talks and Jay and Kay have to watch over his daughter, Kima. When she is kidnapped by Frostifarians, her age regressing hypo-spray breaks loose. Now as Kima grows older, Kay begins turning into a baby.
第 13 集 The Bad Doggie Syndrome
播出时间：2000年4月9日
Jay and Kay are moving fast to stop the take over of Earth by the Tunstons, whose king is hiding out in Frank the Pug's body.
第 14 集 The “J” is for James Syndrome
播出时间：2000年5月21日
Jay's destructive joyride in the LTD causes him to be thrown out of MIB. Now, Jay is neuralized and back in the NYPD just as the Bugs arrive.
