The Beast with Metal Teeth

leading from

alien: afterworlds of thought

Richard Keel, an actor whose body height was 7 foot 2 inches appeared as the character named Jaws in the movie "The Spy Who Loved Me" in 1977, and the character's teeth were made from steel and he could bite through cable.

In the Alien production, they also opted to give the Alien inner and outer sets of teeth that were supposed to be steel, although in the end were chrome plated.