Scientific Method

While Voyager studies a binary pulsar, crew members suffer strange afflictions: Chakotay ages rapidly and goes blind, and Neelix breaks out in spots. The Doctor and Torres find odd genetic markers in the crew's DNA. The cause is a team of cloaked alien scientists, the Srivani, who have been secretly experimenting on everyone aboard. When the Doctor is shut down, he leaves a coded message that alters Seven of Nine's vision so she can see the intruders. A crewman dies as a result of the experiments, and Janeway, whose body chemistry the aliens have been manipulating, decides to fight back. Taking the helm herself, she flies Voyager straight between the two pulsars at full speed, gambling that the aliens will flee before the ship is torn apart. They do, Voyager survives, and the Doctor reverses the damage to the crew. Paris and Torres, who suspect their recent attraction was heightened by the experiments, decide to stay together anyway.