As a space shuttle crew returns to Earth, they unwittingly bring alien "seeds" back with them. These seeds begin to germinate, growing into extraterrestrial life forms that require human hosts to complete their development. If the number of alien life forms reaches a critical threshold, they will become an unstoppable swarm, prompting two scientists to race against time to stop the impending catastrophe.
Threshold
A cosmic event sets off a catastrophic chain reaction, releasing a swarm of deadly insects that put humanity at risk of extinction, prompting a joint effort between astronauts and scientists to prevent a global disaster.
