18. The Chest-Burster on Star Trek: The Next Generation
Episode: "Conspiracy" (Season 1, Episode 25)
A notable episode of The Next Generation took a page from Alien's book and featured a chest-burster, only where the creature from Ridley Scott's classic was awesome and frightening, Star Trek's looked like an angry noodle. Not to mention his host getting his face phasered a few seconds prior is just as awfully executed.