Two very hungry dinosaurs discover a time machine and are instantly transported to America in 2018, where they are delighted to find themselves surrounded by food (including pizza and doughnuts), but soon less excited to find themselves surrounded by policemen with guns--so they escape to the time machine, not knowing where it will take them next.

Their magic tree house takes Annie and Jack to Pompeii just as Vesuvius is about to erupt, and they must find a Roman scroll before everything is covered with burning ash.

Told in their alternating voices, twelve-year-old neighbors and former best friends Cora Hamed and Quinn McCauley begin working together to open a wormhole so they can travel through time to prevent the school shooting that resulted in the deaths of Cora's sister and Quinn's brother.

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

A world without UNDERPANTS?!!!When we last saw our heroes, George and Harold, they had been turned into evil zombie nerds doomed to roam a devastated, postapocalyptic planet for all eternity. But why, you might ask, didn't the amazing Captain Underpants save the boys from this frightening fate? Because Tippy Tinkletrousers and his time-traveling hijinks prevented George and Harold from creating Captain Underpants in the first place! Now, having changed...

This time Ranger, the time-travelling Golden retriever finds himself transported to the deck of the USS Arizona on December 7, 1941, where he rescues the young sailor Ben Hansen who is badly burned when the ship explodes--and there is a Japanese-American boy and girl in a rowboat who also need his help to find their father amid the chaos of the attack.

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.

Annie, a teenager in 1999, tries to travel back in time to join her lost love Strat in Egypt in 1899, but instead she ends up in ancient Egypt and in great danger.

The magic tree house transports Jack and Annie to the deck of the Titanic to find the mysterious gift that will free a small dog from a magic spell.

Ranger the time-travelling Golden retriever and young Isaac Pope come together in 1776 during Washington's retreat after the Battle of Long Island, and Ranger stays with Isaac while he slowly recovers from Smallpox--but Ranger's real mission comes later when Isaac is sent to spy out the Hessian troops' intentions before the Battle of Trenton.