James Van Der Beek James Van Der Beek

James Van Der Beek plays a man seeking a really strange type of revenge on Wednesday's episode of Law & Order: Special Victims Unit (10/9c on NBC).

Van Der Beek guest-stars as a med student named Sean who can't forgive the girlfriend who betrayed him and the man she ended up with. But rather than the normal scare tactics, he instead tries to assume the identity of his ex's new guy.

VIDEO: Apartment 23's James Van Der Beek wants Michelle Williams to cameo

"I find out that he was a sperm donor, so I actually pose as him for girls who are wanting to get in touch with their actual biological father," Van Der Beek says in this exclusive video. "Then when I meet these girls, they have a very strong physical attraction to their father for whatever reason. In Sean's words, he gives them what they need." File this one under very creepy.

The guest spot not only gave Van Der Beek the chance to return to drama after recently making waves in the sitcom world playing a heightened version of himself on Don't Trust the B--- in Apt 23, but also to work with someone he's admired since childhood. "Being arrested by Ice-T? I never thought it would happen when I was 13 years old," Van Der Beek says with a laugh.

Watch this exclusive behind-the-scenes video from The Beek's appearance:

Law & Order: SVU airs Wednesdays at 10/9c on NBC.