When Spydra finds the gateway to the Netherworld in an Egyptian pyramid, she captures all the world's leaders and is about to exchange them for mummies. It's up to Gadget Boy, Agent Heather, and G-9 to reverse the mummy's curse and save the day.

Spydra plans to seize the magnificent jewels of Ivan-the-Not-So-Terrible from the Russian Museum when they are put on display for the first time ever. Gadget Boy, Agent Heather, and G-9 go undercover as a Hip-Hop Band to stop them. When the heist succeeds despite their plans, a wild chase across the Tundra and aboard a Russian Freighter follows. Our heroes recover the jewels just in the nick of time.

Spydra takes control of the world's bubble gum cards, so that each card bears her sinister image. Gadget Boy, Agent Heather, and G-9 track her down to the Bubble Gum Card Factory, where G-9 is put through the works. In a remote-controlled airplane dogfight, Gadget Boy, Heather, and G-9 keep the cards from being spread to kids everywhere.

Gadget Boy, who thinks it's his birthday, is lured to the Humongous Toy Store, where Spydra-controlled evil toys are taking over the shelves and preparing to eliminate Gadget Boy. Quick-thinking Agent Heather (disguised as a giant Teddy Bear) and faithful G-9 head off the toy attack while Gadget Boy makes the world safe for good toys.

Gadget Boy, Agent Heather, and G-9 take a trip to Ireland when the Irish Interpol Chief and the King of the Leprechauns have been kidnapped by Spydra. Her plan: to force the King to reveal the location of the Leprechaun's pot of gold, the source of all gold in the world. Gadget Boy and G-9 locate the King while Agent Heather and the tiny Leprechaun Princess, Faith 'n' Begorra, set a golden trap to trick Spydra.

Spydra is annoyed that none of the world's great portraits show her lovely face. So she steals the Mona Lisa and kidnaps famous Parisian Painter Vincent Van Stop-n-Go to repaint the portrait to look like her. Gadget Boy, Agent Heather, and G-9 track her down too late to save Stop-n-Go. It takes all their combined efforts, gadgets, and some invisibility powder to steal the painting back... just in time for its restoration unveiling.