Michael Showalter has made a cottage industry of finding the humor and humanity in tough situations such as terminal illnesses, and his latest directorial effort, Spoiler Alert (C+), presents some charming and underrepresented character types facing the Big Sick at the center of what would otherwise be a melodramatic “Movie of the Week” type format. Jim Parsons portrays real-life television critic Michael Ausiello, and Ben Aldridge plays his partner Kit Cowan who faces a cancer diagnosis. The film traces the duo’s unlikely romance, introduces some underused supporting characters including Sally Field as Kit’s mom and flashes to occasional strained sitcom tropes to punctuate the proceedings. Parsons is a wet blanket of a romantic lead, barely capable of bearing the burden of the story on his shoulders. Although often heartfelt and packing a few laughs and tears, the film doesn’t rise to the level of being very magnetic or memorable.