After retrieving the Crystal Skull in Utah, Flynn Carsen receives a map in the mail with the secret location of King Solomon's Mines. When the scroll is stolen, Judson explains the power of the Key of Solomon's book and assigns Flynn to retrieve the map. The map is useless without the legend piece to decipher it, which is located in Volubilis near the Roman ruins in Morocco. Flynn heads to Casablanca to the ruins where he is chased by a group of mercenaries leaded by General Samir. They too want to find the location of King Solomon's mines. Flynn teams-up with Professor Emily Davenport working in the dig and they escape from General Samir and his men. While traveling to Gedi, they save the local Jomo from death and the trio faces a dangerous journey through the wild Africa.

When Environmental Protection Agency inspector Steve Malone travels to a remote military base in order to check for toxic materials, he brings his family along for the ride. After arriving at the base, his teenage daughter Marti befriends Jean Platt, daughter of the base's commander, General Platt. When people at the base begin acting strangely, Marti becomes convinced that they are slowly being replaced by plant-like aliens.

Charlie Simms is a student at a private preparatory school who comes from a poor family. To earn the money for his flight home to Gresham, Oregon for Christmas, Charlie takes a job over Thanksgiving looking after retired U.S. Army officer Lieutenant Colonel Frank Slade, a cantankerous middle-aged man who lives with his niece and her family.