After checking in with Hershel and evading the walkers in real life, Rick hallucinates that he's back at the hospital from the very first episode. He decides to open the now-iconic doors reading "Don't Open, Dead Inside," and a blinding flash of bright white light spills in. Rick then finds himself in a gruesome sea of corpses.
He recognises people who have passed on the show before, like Beth and Carl, as well as people who have yet to die, like Maggie and Tara. Sasha (Sonequa Martin-Green) then rises from the ground, and Rick tearfully tells her, "They're all dead." She tries to tell him that it's OK, because he did his "part" like she did hers.
"You gave us the strength that we needed to do what we had to do for the others. The others draw strength from us," she explains. "We change each other. We help each other. We make each other better." When Rick repeats that he needs to find his family, Sasha tells him he won't find them because they're not lost, and neither is he.