S2·E17 Bliss

Lili becomes infected by a highly addictive drug called Bliss. Liam and Sandoval go to Ireland to investigate the drug's origin, where they meet Dr Cox, and a cult of "Taelonists" who deny knowledge of Bliss. They discover a lab where Ma'el worked on an antidote for Bliss, suspecting the Taelonists found the lab and are spreading Bliss.