The life of a schoolboy Filipp Dinozavrov is full of failures, but one day he opens a portal to the Mesozoic era.

Discord in the Dinozavrov family. Father - the Doctor - is busy saving the once famous museum of paleontology. The Doctor's son, Fil, suffers from unrequited love, and daughter Linda is completely lost in the world of computer games. Everything changes on the day when the family enters the prehistoric world through a secret portal. Finding themselves in the most unpleasant and dangerous conditions, they are forced to somehow survive and act together.