 The episode 's premise became a recurring theme in the series , with episodes such as " Darkness Falls " and " Firewalker " repeating the combination of remote locations and unknown lifeforms . A similar plot was featured in " The Enemy " , a 1995 episode of Morgan and his writing partner James Wong 's series Space : Above and Beyond , and according to UGO Networks the Fringe episode " What Lies Below " has " basically " the same plot as " Ice " . The episode introduced invertebrate parasites as antagonists in the series ; this plot device would recur in " Firewalker " , " The Host " , " F. Emasculata " and " Roadrunners " . 
