Pantheon Genesis: Part 1
In Pantheon Genesis: Part 1,
two abandoned immortals on a starship above prehistoric Earth spawn a whole family of immortals who come into conflict and crash their ship to the planet below.
In Episode 1,
an alien creates two immortal humans before abandoning them on a starship above prehistoric Earth, and they go on to have twelve kids, who then have kids of their own.
In Episode 2,
the youngest of the second generation of immortals, Kron, overthrows his father, then imprisons all his own children, except one who is secretly hidden on Earth.
In Episode 3,
that hidden child overthrows his father with the help of his many cousins, and in the ensuing battle their entire starship crashes, stranding them all on Earth.