Halloween is all about the fear. So what are some of Syfy's biggest stars afraid of?

Spiders? Yep.

Sharks? Of course.

Snakes? You bet!

High-wire walking? Yeesh!

A world without trees? Uh ... well, okay, that would be pretty bad ...

Watch as the stars of Sharknado, The Magicians, The Expanse, Wynonna Earp, Van Helsing and Incorporated get scared.