Illustrated Book of Mountains and Seas and Strange Beasts

In ancient times, aliens searched for planets suitable for survival in the universe. They brought some creatures to the earth, where they conducted experiments on species improvement and environmental modification, trying to make this place a new home. But at that time, the ecological environment of the earth was still very unstable, and the experiments failed several times. In the end, they decided to give up temporarily, sealed the various biological species in the experiment underground, and left the earth. In 2024, these sealed monsters will return to the earth...