Super Rabbit Boy gained his superpowers when, as a baby, he ate the magic carrot he found in the Wise Woods; now King Viking has built a time machine in order to team up with his younger self, Prince Viking, and prevent Baby Rabbit Boy from finding that carrot--so Super Rabbit Boy has to go back in time, and with help from an unexpected player, save his younger self and protect the timeline.

"The magic tree house whisks Jack and Annie to Africa where they must use magic to save a rhino and her baby from poachers"--

This time the mysterious box that Ranger the Golden retriever found transports him to a Maryland plantation before the Civil War, where he must help a young house slave named Sarah and her younger brother Jesse find their way to the underground railroad and North to freedom, before Jesse is sold to a plantation further South.

Magic tree house series, #21. Jack and Annie are transported by their magic tree house to the time of the Civil War, where they meet Clara Barton.

An accident in Professor Quack's lab sends Gordon Blue (otherwise known as Kung Pow Chicken) and his companions, Egg Drop and Beak Girl, back to dinosaur times, where they meet Dr. Strangebok, an evil chicken who wants to bring dinosaurs to Fowladelphia and take over the city--and the three superheroes, with help from a friendly dinosaur named Sweet Tooth, must find a way to stop her before she turns the city into a buffet lunch for her dinos.

The Bad Guys find themselves sixty-five million years in the past where they must avoid being eaten by dinosaurs, fix their broken time machine, and get back home before an evil alien destroys the world.

Ranger, a time-traveling golden retriever with search-and-rescue training, heads to Normandy on the morning of the D-Day invasion where he meets Leo, a Jewish boy who is hiding with a local farmer, and Walt, a young American soldier fighting to free France from the Nazis.

The magic treehouse takes Jack and Annie back two thousand years to ancient China where they must find the original copy of an old legend before the Imperial Library is burned down by the evil Dragon King.