'The Secret Circle' exclusive clip: Cassie tries to kill Adam with her brain

tsc-darkness-adam-cassie-diana.jpgWho knew that tiny, blonde, dimpled Britt Robertson had this kind of fire in her!?

On this week's episode of "The Secret Circle" -- returning from an excruciatingly long hiatus -- we once again explore the potential and, more importantly, the consequences, of Cassie's dark magic.

She and Adam ( Thomas Dekker) get closer when she confides in him about her father's dark magic bloodline, but when he spills to Diana ( Shelley Hennig) things turn bad, quickly. In his defense, Diana kind of guessed. And also she's really pretty.

Cassie isn't about to let him off the hook easily, though, and when her anger flares... so does her power. Check out the exclusive clip below.

We've already seen the episode, so trust us when we say that if this is what happens when Cassie gets annoyed at a friend, you're not going to want to miss the fireworks when Charles' ( Gale Harold) mother Kate ( Stefanie Kramer) gets an inkling of John Blackwell's family secret.

Will the Circle stick by her even when she's off the rails?

The episode airs Thursday, Jan. 5, at 9 p.m. EST on The CW.

Photo/Video credit: The CW