5 Bugs

Originating from what is widely considered to be one of the worst episodes in the entire series, the infamous bugs are a blemish on the series that appear early in season 1. Simply manifesting as a cursed swarm of insects, the bugs claim victims by burrowing into their body, ravaging them from the inside out.

While this is a cool and scary premise for the Winchesters to face off against, the result is a poorly done CGI plague that ended up being more gross than terrifying.

The creatures' titular episode, "Bugs," is widely considered one of the worst in the series' history for good reason. Between the squeamish visuals, poor editing choices, and source of the curse being the tired trope of a Native American burial ground, the ghostly swarm was simply not set up for success.

The episode they feature in is even referenced multiple times as being bad within the show itself. It's no surprise the bugs never returned, as they went down in history as one of the worst monsters ever featured in .

4 The Living Teddy Bear

Occasionally, would take a swing at a more original monster for Sam and Dean to encounter.

Season 4's "Wishful Thinking" swung and missed with the inclusion of Teddy, a living stuffed animal with a death wish. Not only being completely harmless as a threat, Teddy is up there as one of the most downright sad creatures the Winchesters have ever encountered. After the Winchesters arrive in a town with a working wishing well, they encounter a girl named Audrey who used the well to wish for a bear that was "

The article is not finished. Click on the next page to continue.