Threshold (2003) is a TV Movie, Science Fiction, Thriller film that follows alien seeds hitch a ride to earth in a space shuttle crew and begin to grow. When their numbers reach the Threshold amount they will be an unstoppable swarm. Threshold is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 4.8 out of 10 from 34 votes. Fans of tv movie movies may also want to explore similar titles below.