Faceless alien rebels are committing mass murders. Mulder and Scully meet a multiple alien abductee, Cassandra Spender. As the consortium tries to determine how to deal with these new alien rebels, Mulder and Scully work to figure out Cassandra Spender's connection with these mass killings. In their way is Agent Jeffrey Spender, who doesn't believe that his mother, Cassandra Spender, is an alien abductee.