Introducing "Query the Theory", a new show from WMUK where we pick apart prominent pop culture ideas, to determine which outlandish, outrageous, obscure and incredible notions have the most credibility. For today's show, we're dissecting the popular "Doctor Who" fan theory, that Mary Poppins is a Time Lord!

Nagini was at Voldemort's side throughout the "Harry Potter" books and movies, but the "Fantastic Beasts" series has since tried to give the character a backstory. Naturally, the fan theories have been steadily flowing ever since the maledictus character was added to the series in "The Crimes of Grindelwald". But, wait? What's that? Nagini is actually the Dark Lord's mother?? Voldemort's mum is actually his snake??? Is this real, or have you just been on the butterbeer again?