With a $103 million worldwide opening, it’s no surprise that Warner Bros. and Legendary are already developing a sequel to Godzilla—a franchise that will never run out of story directions, so long as there are more radioactive monsters to fight. Much as he kept the audience in suspense, wondering whether Godzilla would show up in a Godzilla movie, director Gareth Edwards has been predictably coy about any sequel talk, and as of yet he’s not officially attached to return. But screenwriter Max Borenstein has been a little more forthcoming, both about its inevitable prospects and what it might entail—noting that Godzilla already has an Easter egg in which [spoiler alert] an empty aquarium labeled “Mothra” is glimpsed. Still, Borenstein stopped short of saying definitively whether that means Mothra—or any of the other original Toho characters—will make an appearance.