Death's Other Dominion (1974)

on ultima thule, a frozen planet, a human settlement survived led by dr. cabot rowland. they are the survivors of the 1986 uranus mission, whose captain jack tanner seems to have gone mad after the shipwreck. rowland claims to have been there for almost 900 years and discovered the secret of immortality; a secret that will reveal to the alphani if ??they will join him in the eternal journey he intends to undertake to discover the cosmos. koenig fails to share the collective enthusiasm and, investigating, discovers the victims of rowland's experiments. one of these is tanner himself, who continues to obsessively repeat a warning that will prove prophetic: "death reigns supreme!".