Twelve Monkeys (1995)

And so, what is it, that nasty cop from the House?

@Stupid Penguin: Dr. Peters (laboratory employee) eco-activis, a psychopath, wants to "cleanse" the planet of humanity, for this he steals the virus from the laboratory and flies through the cities releasing the virus, the psycho (Pete) is a half-wit - a false trail, distracts attention with his antics, has nothing to do with the virus; Bruce, as well as others before he has a mission to find the source of infection, and he contacts Dr. Peters at the airport (when he tries to fly away with the virus), when Bruce tries to kill Peters, Bruce is killed in front of the boy - the boy is young Bruce, these events are imprinted in his memory, so he successfully finds the source of infection when he grows up, but Peters It has not been stopped, the epidemic has begun, the loop has closed

@JR13: it depends on how to interpret the final scene on the plane. A female scientist from the future finally got to the virus samples, and that was Cole's original mission.