Raising trouble for the Flash and the citizens of Central City is about to be a family affair.

Peyton List has just been cast as Lisa Snart (known in comics as The Golden Glider), the younger sister of Wentworth Miller’s Captain Cold, Access Hollywood reported.

List is set to first appear in the episode Rogue Time. Whereas her older brother is reserved and calculating, Lisa is impulsive and anxious to prove herself as an ideal fit for Cold's criminal gang. Seductive and sinister, Lisa will cross paths with Cisco which raises even more problems for the Scarlet Speedster.

List isn't the only Tomorrow People alum appearing on The Flash. Robbie Amell has a recurring role on the freshman series as Firestorm.

The Flash returns with new episodes on January 20 on The CW.