who did rick speak to on the phone
Hounded (The Walking Dead) Rick (Andrew Lincoln), still trying to cope with the death of his wife, Lori (Sarah Wayne Callies) after childbirth, is alone in the prison boiler room where she had died when the phone rings. He answers it to hear the voice of Amy (Emma Bell) telling him she is in a safe place and will call back later. Later, a second call from Jim (Andrew Rothenberg) asks him to explain his justification for killing other people and berates him for refusing to talk about Lori's death before dropping the call. A third call from Jacqui (Jeryl Prescott Sales) draws Rick to try to explain his refusal to talk about Lori's death. Finally, the last call is from Lori; realization dawns on him that these calls have come from those that have died, and all imagined as part of his grief. He leaves the boiler room, cleans himself up, and goes to join the rest of the group, seeing his daughter for the first time since he saw Maggie carry her into the yard after she was born.
Rick Potion No. 9 Hiding from the infected population in the desert, Rick makes a third serum to try and undo all the previous ones. But as the serum was amalgamated from various DNA sources ("Koala mixed with rattlesnake, chimpanzee, cactus, shark, golden retriever, and just a smidge of dinosaur," in Rick's own description), it only further mutates the world's population into barely humanoid blobs. Dubbing the monstrosities "Cronenbergs" (a reference to famous director of body horror films David Cronenberg), Rick decides the situation is beyond repair; rather than make another attempt to fix the world, he instead finds another dimension in which two specific events occurred: an alternate version of himself and Morty successfully created a working antidote and turned everything back to normal, and also died soon afterwards. Rick and Morty enter the new reality, the latter visibly traumatized by the transpired events and his counterpart's gruesome death, and they bury their alternate selves in the backyard before quietly assuming their place, leaving no one but themselves with the knowledge of what has actually occurred, ending with the song "Look on Down from the Bridge" by Mazzy Star.