Mindwarping animation meets paranoid slackers from the future in Richard Linklater’s adaptation Philip K. Dick’s sci-fi novel. Starring Keanu Reeves as a schizophrenic undercover cop, Winona Ryder as dealer and love interest, and Woody Harrelson and Robert Downey Jr. as drug-addled buffoons. A Scanner Darkly opens today. Jürgen reviews.