Glomgold sells a useless island to Scrooge, but upon learning that the island is rich in diamonds, he gets it back by trickery. Scrooge decides to travel back in time to prevent this from happening, but ends up in the distant past.
Scrooge tries to return to the present, after being stranded in prehistoric times. On the way he discovers stowaways - a cave duck named Bubba and his pet triceratops Tutsi.
After returning to the present, Scrooge get his hands on the diamond mine, stolen from him by Glomgold in the previous episodes. Meanwhile, Bubba tries to get used to living in the modern world.
Scrooge hires accountant Fenton Crackshell to keep track of his fortune. When Fenton hears Scrooge wants his assets kept 'liquid,' he ends up dumping the entire fortune in Lake Dobegone, where the Beagle Boys soon find it.
Gyro creates a wearable suit dubbed "Gizmoduck," which accidentally finds it's way into Fenton Crackshell's hands. However, Fenton soon uses the suit to become Duckburg's newest hero, much to the chagrin of the Beagle Boys.