A national tragedy forces Olivia to return to work at the White House. Meanwhile, we learn more about the first few days of Fitz's presidency.
To locate a potential cure for Scully’s illness, Mulder accesses a secret research facility, leading to a stunning revelation about the origins of her cancer.
Mulder fights to prove that a discovery frozen in the mountains of Canada is irrefutable evidence of alien life, but his quest for the truth leads to only more lies…and an unthinkable conclusion.
Five-0 must protect the sole witness in a high-profile murder case, a task that grows even taller when it turns out that multiple assassins are targeting her.
Scully learns new details about her sister's murder as Mulder pursues the shapeless alien entity inside Krycek's body.