EXCLUSIVE: The 'Shadowhunters' Stars Reveal Why You Can't Miss This 'Dark' and 'Sexy' New Show!

"You're Clary freakin' Fray, you can do anything!"

It's time to welcome another kickass leading lady to the small screen in the upcoming ABC Family (soon to be renamed Freeform) drama, Shadowhunters.

Based on the best-selling book series, The Mortal Instruments by Cassandra Clare, Shadowhunters will take fans on an action-packed ride filled with drama, demons and plenty of "sexy" moments -- and only ETonline has the exclusive scoop straight from the cast!

WATCH: 'Shadowhunters': Clary Is 'Ready' to Accept Her Demon-Hunting Destiny!

"The Shadowhunters story is about Clary Fray being sucked into the Shadowhunter's world," Dominic Sherwood, who plays Jace, shares in our video above. "The tagline is all the legends are true so everything you ever grew up hearing about, the fairy tales, they all exist in this world."

Katherine McNamara, who stars as the hybrid heroine Clary, promises that fans are in for a treat when "demons, vampires, werewolves, seelies, warlocks, and any other manner of creature" are introduced to the audience through Clary's eyes.

"On her 18th birthday, things start to happen and [Clary] starts to see all these weird things, and having all these weird flashes of memories," the 20-year-old actress reveals. "She discovers that she is in fact a Shadowhunter, which is a half angel, half human hybrid."

So what exactly must Shadowhunters do? "Their sole purpose in the world is to protect the humans -- or the mundanes -- from the rest of the shadow-world," McNamara explains.

Press play on our first look video above to get even more Shadowhunters scoop from stars Matthew Daddario, and Harry Shum Jr.!

The series premiere of Shadowhunters debuts Tuesday, Jan. 12 at 9 p.m. ET/PT on Freeform.