Supernatural's Charlie Bradbury won't be 100 percent alone when she returns from Oz.

What's Next For The Mark Of Cain On 'Supernatural'? Jensen Ackles Talks 'Snakes In The Grass'

The techie-turned-hunter followed Dorothy down the Yellow Brick Road in season 9, but Felicia Day's character will make a return to reality in season 10.

Unfortunately for Sam and Dean, their pseudo little sister will bring along a sinister hitchhiker.

'Huge Twist' Coming In 'Odd' 'Supernatural' Episode, When Will It Air?

"All I can really say is Charlie definitely comes back from Oz and she's brought back something that's pretty scary," teased writer Robbie Thompson ("Fan Fiction," "Slumber Party"), according to Comic Book Resources. "She's going to have to confront it with the boys."

Executive producer Robert Singer previously told TV Line that it's "a Charlie we haven't seen before." Thompson didn't say exactly what would be different about Charlie, but hunting for over a year could change the optimistic ball of energy.

"We've always tried to tell a new chapter of Charlie's life when she appears," Thompson explained to Comic Book Resources. "I always believe that every character is the hero of their own story and that' definitely true with Charlie. This episode is another chapter in her ongoing journey and continual growth as a character."

Charlie will reappear during the first half of season 10. Find out more when Supernatural airs Tuesdays at 9 p.m. ET on The CW.

Tags: supernatural television the cw