Season Two Edit
Raul is shown visiting Sara Patrell's house at some point in the past, though it is ambiguous whether he visited physically or through Jonas.
Jonas recounts the birth of Raul's cluster, including the fact that Jonas had personally met Raul. Lito recalls his sexual encounter with Raul.
In an argument between his cluster and Angelica about some kind of research, Raul accused Angelica of "hid[ing] out in Walden while they herd the rest of us into cattle cars."
At some point after Raul was lobotomized, Angelica summoned Whispers and Dr. Metzger to the cabin, telling them that Raul was trying to destroy her work. At the same time, Angelica used Raul's body to call his father and self immolate, incinerating the cabin and killing Raul.