GP helps Turtle build a 'Turtle-ma-bob' that can climb over almost everything. All goes well until Turtle decides to test out a special button on the machine, sending him on a wild ride.
GP insists on giving Martha a better way to clean up the river, Hammy a better way to dig his garden and Turtle a better way to count his steps. But he just might be pushing himself too hard.
Turtle decides he likes living in his shell so much he wonders why everybody else doesn't do the same, so he heads off in search of fellow shell-dwellers.
Martha builds a houseboat so she and Hammy can go cruising, but it's too small for GP to join in so he decides to build an invention to call them back home.
Hammy finds some eggs in the bushes and thinks they belong to Robin, and soon all the animals have come together to gather up all the eggs. But Granny Rabbit and Ferret both have surprises in store.
Martha and Wise Old Frog try to cheer Hammy up when he wishes he was bigger, but it's only when Turtle gets into a tight squeeze that Hammy realizes being small can make a big difference.
Martha realizes teaching Hammy about time wasn't such a good idea when the nervous hamster begins to stress about fitting all his daily activities into twenty-four hours.
GP'S globetrotting Battery Operated Rodent of Steel (BOROS) returns home for a visit, and all the animals try to impress him by boasting about how exciting their lives have been since he has been away.
Martha builds a huge airplane so she can take her friends to see the world, but they only get as far as the barnyard before they run into some trouble.
