'Aquaman' and 'Mary Poppins Returns' will go head to head in a massive box office holiday battle.<br />Comic Book.com reports 'Mary Poppins Returns' hits theaters for an extended weekend outing on December 19th.<br />'Aquaman' will be released on December 21st.<br />Right now, industry analysts give Mary Poppins the advantage.<br />According to early tracking reports (per Deadline), Mary Poppins Returns is eyeing a $70 million plus debut in its opening week. <br />
