Duke Igthorn remembers a story about the Gummiscope, a signal machine whose solar power could also be the perfect weapon for him to conquer Dunwyn. Cavin catches him sneaking off with a page on it from a book on Gummi Bears, and tells the Gummis who learn it's the signal machine their ancestors were left with to contact the other Gummis who fled abroad, when humans are no longer a threat. They locate it and contact one group of Gummis but Tummi's knocking the ray off-course results in Igthorn's spotting it, and they're forced to retreat from his attack. He claims the machine and attacks Castle Dunwyn with it, injuring Calla and demanding surrender. The Gummis and Cavin have only a short time to stop him from destroying Dunwyn with sunlight. Written by
Did You Know?
We should be near the river's source.
[the Quick Cars shoot on then under water; he gets it out of his mouth on the other side
I think we found it.