Riverworld stars Tahmoh Penikett, Laura Vandervoort, Jeananne Goossen, Alan Cumming, Mark Deklin, and Peter Wingfield.

Instead, they awaken in an enigmatic realm called Riverworld, a vast and extraordinary planet where every soul that has ever lived on Earth has been reborn along the banks of an endless river.

On the other hand, Matt finds solace in the company of friendly individuals such as the renowned American author Samuel Clemens, also known as Mark Twain, and Tomoe Gozen, a 12th-century Japanese warrior from the time of the Genpei War who is wedded to Minamoto no Yoshinaka.

In pursuit of their respective objectives, both factions clandestinely enlist champions, despite their laws strictly forbidding direct interference with humans.

Within this world, a unique trait grants every human being effective immortality, preserving their perpetual youth and robust health, irrespective of their age at the time of their demise on Earth.

While they can experience death, the remarkable aspect of Riverworld is the phenomenon of resurrection, wherein deceased individuals are continuously reborn at different locations along the river.

It is later unveiled that this exclusion from the grail bands not only grants them freedom but also acts as a mechanism to evade the vigilant surveillance of the caretakers of Riverworld.