While on a mission, three astronauts in their spaceship get caught in a time vortex. They return to Earth in the year 3979 A.D. and discover that intelligent apes are now the highest form of life.
Flames of Doom
Escape from Ape City
The Unearthly Prophecy
Tunnel of Fear
Lagoon of Peril
Terror on Ice Mountain
River of Flames
Screaming Wings
Trail to the Unknown
Attack from the Clouds
Mission of Mercy
Invasion of the Underdwellers
Battle of the Titans
