The actor will guest-star on the famed show this season.

According to The Hollywood Reporter, the Ringer actor will be visiting the long-lasting CBS show and his character will be all but kind and innocent.

Polaha will play Darryl, a “charming mechanic” who at first seems very likable and later on will reveal his true self and his dark intentions.

The actor’s credits include Ringer, Made in Jersey, Life Unexpected, Mad Men and Dollhouse, among others.

Kristoffer is set to appear in the 10th episode of CSI‘s 14th season, which will air November 27th. CSI airs on Wednesdays at 10 p.m on CBS.