For Henry and his big dog Mudge, summer means going on a picnic in the park, taking a bath under the garden hose, and going to the top of the big green hill.
Mr. Putter and his fine cat, Tabby, and Mrs. Teaberry and her good dog, Zeke, head for the sledding slope for the wildest ride ever. Maybe winter is not so slow after all!
Annie and her pet rabbit, Snowball, invite Henry and Mudge to a dress-up birthday party, but there is some confusion about what the guests are supposed to wear.
When Mr. Putter and Tabby take Mrs. Teaberry to the Conservatory for her birthday, Zeke tries his best to stay out of trouble, but one of the trees is irresistible.
While enjoying autumn weather and activities, Mr. Putter, realizing how much he misses going to school, takes his cat Tabby, their adventurous neighbor, Mrs. Teaberry, and her cake-loving dog Zeke to "Show and Tell."
When Mr. Putter cannot sleep after eating too many of Mrs. Teaberry's pineapple jelly rolls, he and Tabby take a moonlit stroll that ends with the perfect neighborly gathering.
Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle.