Writer Masaru Igami was also story writer for Prince of Space.This film was especially popular in Russia.

The 'Legend of Dinosaurs' is one of several films that drew inspiration from the successful 1975 shark attack film Jaws (which later became a RiffTrax presentation).It is theorized that Toei produced The 'Legend of Dinosaurs' to capitalize on the Nessie film, which was never produced. These common elements include the climate anomalies that awaken the creature, the lake setting, and the use of a plesiosaurus (inspired by a popular theory in the 1970s on what the Loch Ness Monster is). There are some similarities between this film and a planned 1976 joint production of Toho studios and Hammer Film Productions called Nessie.The film's creatures are a plesiosaur and a rhamphorhynchus, which are classified as extinct reptiles not related to dinosaurs. None of the creatures depicted in The 'Legend of Dinosaurs' are actually dinosaurs.At the time of its release, this was the most expensive film Toei produced.Due to unprecedented climate changes, the egg of an unknown creature hatches, and the various monsters converge.

A scientist investigates caves nearby, seeking proof of his father's theories about long-lost prehistoric life forms. In Japan, villagers are tormented by a giant sea monster.

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