By Clark Collis
April 09, 2017 at 02:30 PM EDT

We’ve known for a while now that Peter Capaldi will meet some vintage monstery characters during the new season of Doctor Who, including both the Ice Warriors and the Mondasian Cybermen. But what new creatures will the Doctor, Matt Lucas’ Nardole, and Pearl Mackie’s Bill encounter when the show returns to BBC America on April 15?

Saturday, the BBC released an interview with Doctor Who executive producer and head writer Steven Moffat, who teased a number of the monsters to be featured in the new season, the last run of shows for both Moffat and Capaldi.

“By nature, I’m just excited about all new monsters, but we’ve got some wonderful stuff!” he said. “We’ve got a serpent that lives under the Thames in the shape of the Thames which, now that you realize it, the EastEnders title sequence has always clearly been about a giant snake. We’ve got the Emojibots, which are small, cute, and communicate by emojis and turn you into skeletons, so that’s brilliant. We’ve got the most shiver-making creatures in [writer] Mike Bartlett’s episode — not going to tell you what they are… but I guarantee there are moments that will make you go ‘URGH!'”

“I’ve been looking at some of the effects for episode 4 and you think, ‘Oh my god, are we putting that on television?!'” he continued. “It’s really properly gross and magnificent. We’ve got a new enemy, which I won’t talk too much about, but we call them the Monks, though that’s not really their name. We’ve got a fabulous Scottish creature care of [writer] Rona Munro — The Eater of Light. The Ice Warriors are back with a new wrinkle and, of course, Missy is there — always with Peter Capaldi’s Doctor — he’s up against Missy, tested and teased and entranced by his oldest friend and wickedest enemy.”

Watch the trailer for the new season of Doctor Who above.