What to know

• The squirm-inducing take on a mid-tier Batman villain was written by modern horror favorite Mike Flanagan. Clayface Is DC Comics’ Scariest Horror Movie Ever: Review Liz Shannon MillerS1
• We are now three movies into the so-called DC Universe — branding that so far doesn’t appear to have cut through to any but the most devoted of nerds. Last year’s “Superman” reboot was respectable enough, this summer’s “Supergirl” a bit less so, but the prospe...S2