Here's the thing about a lot of science-fiction post-2001: A Space Odyssey: At a certain point, if you aren’t paying attention to every little detail, things start to make absolutely no sense. In Syfy's event series Nightflyers, this effect is compounded by the very fact that, as the crew of the Nightflyer floats ever closer to their extraterrestrial goal, things on board the ship start getting Very Weird.
When the band of buddies fly the Nightflyer out into deep space to make contact with what they believe is alien life -- a probe from the volcryn -- they find out that whatever is out there is emitting the same energy, albeit way more powerful, as their resident violent telepath they've brought with them to communicate with the otherworldly force. About halfway through the season, the volcryn energy and the spaceship itself -- which happens to be somewhat possessed -- begin messing with the crew's minds, sending them memory hallucinations and making all telepaths onboard (twist: there are actually two!) more powerful, and therefore more dangerous.
The malevolent force inside the ship turns out to be its reclusive captain's mother, Cynthia (Josette Simon), who uploaded her consciousness into the Nightflyer's computer core before she died so she could control everything even after her death. When tech expert Lommie (Maya Eshet) attempts to excise her consciousness from the ship, Cynthia instead takes over Lommie's body and attempts to turn the ship around and head back home, or, barring that, destroy the massive alien consciousness they're all swiftly approaching.