“Killer Prom” (*1/2 out of four) was a ridiculous thriller about a teenager and her father (Erica Anderson and Mark Lutz) who welcome in someone who claims she is a distant cousin (Yvonne Zima) but who (yawn) sets a plan to murder her way into the family and recreate the prom that she never got to experience as a young girl. Typically obvious and predictable story but unusually mean-spirited and illogical and film’s climax is laughably dumb. Recommended only for young girls who never saw “Obsessed.”