11岁的小怪和7 岁的奇奇是生活在中国北城的两个普通的小学生，也有其他小朋友一样的烦恼。一次偶然的机会，姐弟俩无意中打开了一个连接到远古时代的虫洞。猛犸象、霸王龙、二齿兽，许多好玩的远古动物穿越虫洞来到他们的生活中，成为了他们的好朋友。

虫洞里来的朋友，给他们带来了许多麻烦和快乐——有时是一只怕热的冰河时代的猛犸象恰巧出现在酷热的夏日，这让暑假的补课班变成了冰雪嘉年华。有时是一只超级喜欢跳舞的霸王龙，把学校的晚会闹了个底朝天。有时是来找丢失的宝宝的剑龙妈妈，差点被别人抓住带走……每集的故事中，小怪和奇奇姐弟都面对好多虫洞里来的朋友带来的问题，他们不得不想尽办法去解决。

虫洞的开启和关闭变得越来越不稳定，一只五层楼高的马门溪龙让虫洞的秘密彻底曝光。小怪奇奇终于向爸爸妈妈坦白，一家人齐心协力，老师和同学们也都来援手，共同面对企图抓走远古生物的科技大亨马瓜瓜。

Kim is 11  and Jim is 7, they are two ordinary primary school students living in Beicheng, China. During a thunderstorm, they accidentally create a wormhole that connects a time tunnel. Different ancient animals travel through the wormhole and become their best friend and a big secret.

Wormholes open at irregular times, often giving them trouble or different choices, sometimes in the middle of summer to send a hot mammoth, resulting in summer make-up lessons into a canteen ice carnival、Sometimes tyrannosaurus Rex, who liked to dance to music, would break into the school to report on the show. Sometimes the mischievous twin velociraptor makes a mess in the bedroom before their mother gets home... In each episode, the oddest siblings face the challenges of a wormhole, hiding in front of their parents, teachers,and classmates...

However, as the wormhole opened and closed more and more erratically, a five-stories high Mamensheosaur brought its secrets to light. Kim and Jim finally confessed to mom and dad, love and tolerance let them together in a critical moment, teachers and students are also to help, to deal with the attempt to use the wormhole to save their bankrupt company of technology tycoon MelonMa. In the moment of crisis, Kim and Jim also realize that they are necessary for the wormhole to open. In order to protect the animal friends in the wormhole, Kim bravely chose to enter the wormhole. Crisis lifted, Kim alone trapped in the ancient times, everyone is looking forward to the wormhole once again open ……