02E18 - Fearful Symmetry

Mulder and Scully investigate strange occurrences when an invisible forces seems to wreck the downtown of Fairfield, Idaho and an elephant from the local zoo is found lying on the highway some 40 miles away. No one at the zoo can figure out how the elephant got out of its locked enclosure and animal rights activists have been active in condemning the way the zoo treats its animals. It's not the first time animals have escaped or disappeared from the Fairfield Zoo but when an animal activist is mauled by an invisible tiger, they're dealing with something no one has encountered. When Scully determines that the elephant and the tiger had been pregnant leading Mulder to believes that the animals are perhaps being abducted by aliens.