When does Primal return?

Primal (also known as Primal or Primal: Tales of Savagery) is an American adult animated action horror television series created by Genndy Tartakovsky for Cartoon Network's night-time programming block Adult Swim. Set in an anachronistic and fantastical prehistoric world, the series is about the survival and bond between a Neanderthal man Spear and a female Tyrannosaurus rex named Fang as they struggle day-to-day and battle against various carnivorous dinosaurs, prehistoric mammals and other dangerous animals. In season three, Spear is revived as a zombie years after his sacrifice in the previous season. The show has won three Outstanding Individual Achievement in Animation Juried Awards from the Emmy Awards.
Set in an anachronistic and fantastical prehistoric world, the series is about the survival and bond between a Neanderthal man and a female Tyrannosaurus rex named Fang.