Tread Perilously's Doctor Who month continues with the recent "Arachnids in the UK."

When the Doctor brings Yaz, Ryan, and Graham back to Sheffield, she meets Yaz's family and discovers a mystery under the city. Large webs and giant spiders are infesting the area and it all seems centered near a new hotel built above a former mine. Yaz's mother is to be the general manager of the new resort, but billionaire developer Mr. Robertson feels differently after he experiences her can-do spirit. Will the secret under the hotel kill them all before her sacking takes proper effect?

Erik and Justin try to name the Scottish exit from the United Kingdom while Justin tries once again to crown Karen Gillan as queen of a free Scotland. It leads to an oddly political discussion about Western Europe. They also get lost in memories of various creature features. Pulp proves not to be the Sheffield band Justin wants to hear. Erik tries to review "Planet of the Spiders" without revealing too much. Missing storytelling elements in the episode lead the pair to make certain conclusions about underwritten characters. Justin compares Chris Noth's performance as Robertson to 30 Rock's Jack Donaghy. Erik tries to convince Justin he's seen Noth before. The pair also imagines the Jedi Afterlife as a place where you keep your worldly injuries and accidentally pitch a Goop article.