In the 22nd century AD, due to over-expansion of population, over-development, extreme environmental deterioration, and depletion of food, humans must go to the universe to find new planets to live in if they want to survive. Therefore, a most advanced spacecraft at the time was built to investigate a planet that might be suitable for human survival. The Robertson family (played by William Hurt) was selected to undertake this exploration mission, and they will take 10 years to travel to the planet Alpha. However, there are voices of opposition to the mission of taking on the fate of all mankind, and some evil forces attempt to stop this mission. Therefore, when the Robertson family drove the spacecraft into the predetermined orbit of space, the opposition Dr. Smith secretly sabotaged, causing the spacecraft to deviate from the normal orbit and land on an unknown planet. The obstruction of evil forces on the spacecraft, the various crises on the unknown planet, how to reset the new route... Various problems puzzled the Robertson family. Are they really lost in space and unable to reach their destination? Where will the fate of mankind go?