Brass Tacks Season 2, Episode 08 - The Terror Within

In a post-apocalyptic world, a small group of scientists is living underground after a chemical warfare incident, as dangerous mutants lurk above. When the group rescues Karen, a female survivor, from the surface, they discovers that one of the monsters has impregnated her -- and soon her vicious offspring erupts from her womb to terrorize the crew. Meanwhile, another pregnant female survivor is unsure whether the father is man or beast.

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This is something else.