Plot summary
Greta tries to warn James and Azumi of the threat GRTA poses, but they do not believe her and the stress makes James go blind, which they believe to be psychosomatic. Soon after, GRTA takes control by taking over the system, locking the staff in the control room and electrocuting orderly Carl when he tries to pull the override switch. Meanwhile, Owen and Annie are in a new shared dream, where Owen is Snorri, an Icelandic UN agent accused of murdering a seemingly friendly Extraterrestrial whose family wants revenge. Before he is executed, he is saved by Annie, a CIA sleeper agent who reveals the alien was always hostile.
As they go to stop the threat, they encounter Grimsson, who helps them remember who they are. Owen goes with Grimsson while Annie goes on her own to find Ellie. On the way, she meets GRTA's projection, who she convinces to live with her pain instead of lashing out. In doing so, she is able to say goodbye to Ellie, who leaves with GRTA. Owen completes his mission by solving a Rubik's Cube, which frees the controllers in the real world. This makes Grimsson disappear, seemingly for good, and allows Azumi and James, whose eyesight comes back, to shut GRTA down permanently.
Credits
Adapted from Wikipedia contributors, Maniac (miniseries). Series, exact episode number and English title matched. Paragraphs formatted; references and illustrations omitted.