Avengers Grimm (2015), the latest “mock”-buster from The Asylum, is a surprisingly fun mix of NBC’s Once Upon a Time and Marvel‘s The Avengers. It’s like Grimm’s Fairy Tales adapted into a low-budget/high-octane action thriller in which (super)heroines Snow White, Cinderella, Sleeping Beauty and Rapunzel join forces with Red Riding Hood to stop the villainous Rumpelstiltskin…