Hercules put in an underground vault and causes an earthquake

In the aftermath of a massive earthquake in California, a rescue-chopper pilot makes a dangerous journey across the state in order to rescue his estranged daughter.

When a discredited L.A. Seismologist warns of an impending 12.7 earthquake, no one takes her seriously. Now on her own, she races desperately to get her family to safety before the earthquake breaks Los Angeles apart from the mainland.

When villagers begin disappearing it is discovered that they had fallen through a crack in the earth which goes straight to Hades. Hercules once again comes to the rescue and faces one of his most difficult challenges, and must prove himself as a man as well as a god. "Hercules in the Underworld" is the fourth made for TV movie in the series Hercules: The Legendary Journeys.

Hercules, a semi-divine being, squares off against King Minos, who is attempting to use science to gain power and take over the world. With the help of a benevolent sorceress, Circe, Hercules tries to save his beloved Cassiopeia from being sacrificed by Minos, and struggles against laser-breathing creatures and an evil sorceress.

Hercules comes from Greece to Ravenna, Italy, because a friend from childhood days has sent for him: Hercules should help the Roman Emperor who is in danger because of an intrigue lead by the leader of the pretorian guards.