Lost Girl S01E07: ArachnoFaebia
Lost Girl S01E07, Kenzi is running a scam in which she is cleansing homes of evil spirits. She does so in a home where a murder/suicide took place. In the process of doing so, she is bitten by a Djieiene, an Under Fae creature that is similar to a giant spider. Over the course of the episode, Bo is also bitten then Hale and the paranoia created makes them try to kill each other. The only hope for them to be saved is Lauren and Dyson who are running out of time.