When Louise Brealey first joined the cast of “Brian and Charles,” she had no idea what a sensation the deadpan “love story” of sorts about a depressed inventor and his new “7-foot cabbage-loving robot” happened to be. The movie, which opens in theaters Friday, is based on a 2017 short of the same name. Director Jim Archer and starring David Earl and Chris Hayward, they all returned for the feature, but Brealey didn’t realize the impact of the original. “When I got the audition, I had no idea of the sort of cult around the short film. The first I heard was, luckily, after I’d done my recall,” B…
