Timbot's dad has some time off work. He decides to take Tim and Grandpabot to the annual "Funniest Fish Derby." Tim desperately wants to win. He is overjoyed when he catches a big fish, but instead of catching a funny fish, he catches a rare one. The local aquarium is called and happily accepts the new and rare specimen. When the fish is released into the big display tank, something amazing happens. Tim, dad and Grandpabot have unwittingly engineered a very happy reunion.