Mother spider (Arachnids in the UK)

The mother spider was a large spider who grew because of toxic waste dumped at Jack Robertson's hotel.

Eventually the mother spider became so big it began to suffocate, even in a ballroom inside the hotel. When the Thirteenth Doctor, Yaz, Ryan, and Graham with Dr Jade McIntyre went to deal with it, they realised it was dying anyway, and Jade stated the spider was more afraid of them than they were of it.

Robertson shot and killed it, much to the disgust of everyone present. (TV: Arachnids in the UK)