Secret societies -- Juvenile fiction. Assassins -- Juvenile fiction. Memory -- Juvenile fiction. Quests (Expeditions) -- Juvenile fiction. Adventure stories.

Imaginary wars and battles -- Juvenile fiction. Space warfare -- Juvenile fiction. Science fiction. Adventure fiction. Skywalker, Luke (Fictitious character) -- Juvenile fiction.

Justice League of America (Fictitious characters) -- Juvenile fiction. LEGO toys -- Juvenile fiction. Time travel -- Juvenile fiction. Superheroes -- Juvenile fiction. Supervillains -- Juvenile fiction.

Extraterrestrial beings -- Juvenile fiction. Mice -- Juvenile fiction. Planets -- Exploration -- Juvenile fiction. Outer space -- Juvenile fiction. Adventure fiction.

Discoveries in geography -- Fiction. Scientists -- Fiction. Women scientists -- Fiction. Science fiction. Adventure fiction.

Space ships -- Juvenile fiction. Extraterrestrial beings -- Juvenile fiction. Mice -- Juvenile fiction. Space -- Juvenile fiction. Adventure fiction.

Time travel -- Juvenile fiction. Adventure fiction. Science fiction.

Scientific expeditions -- Fiction. Missing persons -- Fiction. Scientists -- Fiction. Psychic ability -- Fiction. Science fiction.

Girls -- Juvenile fiction. Superheroes -- Juvenile fiction. Friendship -- Juvenile fiction. Good and evil -- Juvenile fiction. Human genetics -- Juvenile fiction.

Adventure and adventurers -- Fiction. Ability -- Fiction. Friendship -- Fiction. Atlantis (Legendary place) -- Fiction. Science fiction.