Return to the Lost Planet is a 1954 juvenile science fiction novel by Angus MacVicar, published by Burke, London.

A previous expedition to Hesikos, the wandering 'lost planet' which is now within a few days flight of Earth, has crash-landed, and Dr Lachlan McKinnon (its organiser), Professor Hermanoff and American engineer Spike Stranahan are marooned.

McKinnon's colleagues must build and launch a spaceship from their Scottish base to travel to Hesikos, but to construct the ship they must obtain the expert assistance of Dr Andrieff, a scientist and engineer, who risks exile from his Eastern European country by so doing.

Escaping from a deluge of water, which damages their Jeep, as a river suddenly rises, they take refuge in a cave, which leads to a door.

They explain that since their planet's orbit was destroyed eons ago by atomic experiments, they have lived a peaceful underground existence, only emerging in the mild summer season to gather fruits and plants.