The family, led by Lucien and Calian, sets out on a mission to infiltrate Area 51 in order to decipher the alien communication they had been receiving from Sir Puffy Mittens on Mars. As they sneak through the highly-secured facility, they come across a strange being that is unlike anything they have ever seen before. It is a Martian, who has been stranded on Earth for years. The Martian reveals that it had been trying to send out a distress signal to its home planet, but it had been intercepted by the government and taken to Area 51 for study.
The family is shocked and amazed by the Martian's existence and they quickly realize that they may be the only ones who can help the alien return home. The Martian is able to communicate with them through a universal translator that it had been carrying with it. It tells them that it had been studying Earth's technology and had been able to establish a quantum entanglement wormhole, which allowed for instant communication with Sir Puffy Mittens on Mars.
The family is in awe of the Martian's advanced technology and they decide to team up with the alien to help it return home. They devise a plan to sneak the Martian out of Area 51 and make contact with Space-X to launch a rescue mission to Mars. As they work together, the family and the Martian become close, and the Martian even reveals that it had been watching over them since they had sent Sir Puffy Mittens to Mars.
As they make their way out of Area 51, the family encounters numerous obstacles and challenges. But with the help of the Martian, they are able to overcome them and make it out of the facility. They contact Space-X and together with the Martian, they launch a rescue mission to Mars. As they fly through space, they look back at Earth, knowing that they have made a new friend and that they have helped to reunite a lost alien with its home planet.