Quite alarmingly, the fifth entry in the Ghostbusters series — following straight on from the unexpectedly charming Afterlife — starts by quoting all 51 words of Robert Frost’s 1923 poem Fire and Ice, which posits two very different apocalyptic scenarios for the end of the world. Has the franchise suddenly fallen prey to the glum Christopher Nolanization of what we used to think of as bubblegum entertainment? Is Paul Feig’s controversial 2016 all-female iteration about to be frozen out of the canon? Will it be worthy and… boring?