Unspoiled! The Constant: Lost

In what is the first ever linear storytelling episode of this show, we learn how the Oceanic Five get back to The Island, possibly along with Ben, Lapidus, and a bunch of new Red Shirts. We're not sure about anyone but Jack, Kate, and Hurley though, as they're the only ones we see actually on The Island again. Oh, and they are found by Jin, who is wearing a Dharma jumpsuit and driving a Dharma van. What the hell is going on? WHEN ARE WE?