Anthony Mackie appears to be having a lot of fun playing John Doe, the nameless “milkman” tasked with delivering material between walled cities in a society upended by a technological crash, driving the lawless highways with only his car (who he talks to regularly) as company. Mackie and Beatriz are consistently better than the material – they share one very funny scene involving a children’s ball pit – which really begins to veer off the road when the pair make it to Las Vegas and encounter Arnett’s emotionally needy if murderous clown. Mackie’s mere presence in a streaming series before suiting up for Marvel’s next “Captain America” sequel is probably a win for Peacock, but the road between New San Francisco and New Chicago ought to be paved with a bit more than that