The Outer Limits

S02:É07 - S02:E07 - Invisible Enemy

Two astronauts travel to Mars, but never return. A second expedition is sent to find out why, and two crew members are mysteriously suctioned into the sand shortly after arrival. Only Commander Merritt (Adam West) and his Captain are left -- with the shocking realization that their "invisible enemy" is really a band of man-eating sand creatures! When Merritt is marooned in the middle of an infested sand pool, a safe return to the ship seems impossible. Rudy Solari and Ted Knight also star.