DEEP IN THE SOUTH AMERICAN JUNGLE, A REAL AN SINISTER MENACE LURKS IN THE SHADOWS OF THE SUPERNATURAL....

In a remote lake, a legendary monster, incredibly vicious, surfaces after a sleep of centuries. Acting to protect its oil stake, the U.S. Government calls in...

THE CHALLENGERS!

Men with young faces and old memories move mysteriously in the area, speak in low tones in the capital city. The country's president alerts...

THE CHALLENGERS!

A dying man names a desert fort, many miles away...Bizarre mechanisms keep the curious away...Unseen enemies...Strange accidents...Strong-arm assailants...A hair-raising test of the celebrated ingenuity of the CHALLENGERS OF THE UNKNOWN

Based on the DC Comic