Back in 2018, James Wan's  Aquaman  made a big splash (pun intended) at the box office. In early 2019, we learned about Warner Brothers' plan to develop a smaller-scale horror spinoff based on the creatures that appeared during the underwater trench sequence of that movie. Which seemed weird, sure, but also made sense as a next step in superhero films for the director of movies like  Saw, Insidious,  and  Malignant.  The Trench movie was canceled earlier this...