First, in the City, the Monkey with the Yellow Balloon and the Man with the Yellow Hat walk through town on their way back from circus, when at 9:00 PM, they notice a light on inside the Museum of Science, so Curious George and the Man with the Yellow Hat meet Professor Wiseman, who says that she's still working, to prepare for the upcoming Omaha expedition marathon contest. But when the Man with the Yellow Hat asks Professor Wiseman if she's planning to run the race, she answers that she has never had time to participate in a race, so the Man with the Yellow Hat volunteers to train her.
Now, the next day, as the Man with the Yellow Hat and Curious George begin to train themselves to race the marathon, Professor Wiseman reports that anonymous donors won't contribute to the Omaha expedition unless Professor Wiseman runs the marathon.
Well, the next day at noon in Endless Park, as the Man with the Yellow Hat prepares to train Professor Wiseman, Charkie the black Cocker Spaniel trips the Man with the Yellow Hat, who sprains his right ankle and must withdraw from the marathon while he recuperates. So now, it's up to Curious George to train Professor Wiseman. But, in trying, Curious George runs from Professor Wiseman, whom he expects to ensue him, but she loses her breath and needs water. And when the water fountain at Endless Park doesn't work, Professor Wiseman drops out of training.
Then, the Man with the Yellow Hat, wearing an adhesive wrap around his ankle, shows Curious George a training video for marathon runners so that Curious George may tutor Professor Wiseman on the science of running correctly. (A Goof occurs here, as the cast changes on his foot, from showing the Man with the Yellow Hat's sole, to having his sole covered in the wrap.)
But, the next day in Endless Park, as Curious George trains Professor Wiseman with warm-up stretching exercises, Professor Wiseman decides that she finds running boring and needs a rest from it because she hasn't time to be bored and heads back to the Museum of Science.
So, can Curious George make running fun for Professor Wiseman, by taking her for a ride on a ferris wheel (which rotates backwards) and to his fun places, such as the Zoo and Endless Park with balloons and fountain, to prepare her for race day, as "Curious George, Personal Trainer?"
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Next, in the Country, Curious George attends his first County Sprout outing, as he accompanies the Man with the Yellow Hat, Bill the Country Neighbor Boy, Vickie and her Little Brother on a trip to visit a vegetation forest preserve, as Curious George has been named an Honorary County Sprout, with the Man with the Yellow Hat as Honorary Sprout Master, and Bill the Country Neighbor Boy as Assistant Sprout Master.
Now, as soon as the Man with the Yellow Hat parks his vehicle, Curious George, Bill the Country Neighbor Boy and Vickie and her Little Brother jump out to feast upon the fruits of a wild blueberry shrub, so the Man with the Yellow Hat reads them admonitions from the Official County Sprout Rule Book, which states Rule #1 -- Don't eat from plants without asking an adult, Rule #2 -- Don't break any branches from any trees in the forest, and Rule #3 -- A Sprout must never leave the trail.
Well, now Curious George, Bill, Vickie and her Little Brother are ready to accompany the Man with the Yellow Hat along their vegetation exploration and to search for Doctor Greenbean, who doesn't seem to show for their outdoor meeting, so the County Sprouts search for blackberries and apples along the trail.
But after losing the trail map, which has flown from the window of the vehicle along the route to the vegetation forest preserve, Assistant Sprout Master Bill uses his navigation device to find the way to Doctor Greenbean, but then his batteries wear out, and the County Sprouts find themselves lost in the forest unless Curious George is able to discover the way by climbing a tall tree.
And then, when the other County Sprouts somehow forget Curious George in the tree and continue hiking along without him, Curious George discovers Doctor Greenbean deep in the woods, pruning branches from a tree, which Curious George, not knowing that Doctor Greenbean is in charge of the preserve, grabs his hat to run into the stream to prevent this stranger from removing branches from a tree because that action violates the Official County Sprout Rule Book.
So, as Curious George manages to patch the severed branches back onto the tree with mud from the stream, and with the Man with the Yellow Hat, Bill, Vickie and her Little Brother lost in forest, and with Doctor Greenbean off attempting to retrieve his hat, who will manage to save the day on the first official County "Sprout Outing?"
