Directed mostly by Ben Stiller, the provocative sci-fi series about a mysterious biotech company returns on Apple TV+, starring Adam Scott, John Turturro, Christopher Walken and Patricia Arquette.

Fortunately, “Severance” returns to Apple TV+ on Friday, and its makers seem to have used every second of the absence productively. The season takes new turns while remaining the most ambitious, batty and all-out pleasurable show on TV, an M.C. Escher maze whose plot convolutions never get in the way of its voice, heart and sense of humor.