It turns out that Colonel Nosehair is a budding archeologist and author who has just written a book about the Aztecs. Too bad nobody's coming to his book launch except Gadget with news from General Sir. A recent earthquake in Mexico has unearthed the entrance to the lost lost underground Aztec City of Gold.
Rumour has it the Aztecs hid their "Crown of Invincibility" in the city and it's a prime target for MAD so WOMP has to find it before Dr. Claw uses it to become unstoppable. Colonel Nosehair, Gadget, the Gadgetinis and an Archeologist descend into the city while is Penny's left back at the base camp since it's too dangerous for her to accompany them. She overhears assistant archeologist Ron Limond talking to Dr. Claw about how he has found and hidden the map to the secret entrance & shortcut tunnel that avoids all the traps Gadget & Co. will face. He heads off to the City and Penny breaks into his safe to find the map but unfortunately Ron returns unexpectedly to pick up the crowbar he forgot and catches her. Ron forces Penny into the secret entrance tunnel and beats Gadget to the underground city's treasure vault.
Ron chains Penny to the stone alter below the statue holding the mystic Crown of Invincibility and plans
to leave her there since he's sure help will never arrive. However despite Ron's expectations Gadget bumbles his way past the traps and the living golden guardian idols into the treasure room. While Gadget is accidentally getting the crown off Ron the Gadgetinis use their laser fingers to cut Penny's chains and she leads everyone (except Ron who won't abandon the treasure) back through the secret passage when the underground city starts to collapse.
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