Roswell Conspiracies: Aliens, Myths and Legends (1999)

Season 1: Episode 10

Strange cattle behavior in South America convinces Rinaker to send Nick and Sh'lainn to find out exactly who, or what, is the mysterious Chupacabra. But to their surprise, the truth surrounding the identity and purpose of Chupacabra brings out details about an alien massacre at the hands of a shapeshifter posing as an Alliance operative, and the lost city of the Dark Empire.