Mike was in his 20s but still hung out with high school kids.

The group of them got high and listened to heavy metal and called themselves the Lords of Destruction.

Paul has also appeared in other series includingBig Love,The PathandBoJack Horseman.

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However, his role wasn’t as creepy as his the one he’s most known for.

Englund played Detective Gassner in the Season 7 episode, “Heathridge Manor.”

The BAU investigated a woman found dead in an abandoned asylum.

Criminal Minds

He played Jeffrey Charles in “The Boogeyman.”

The BAU originally profiled the UnSub as an adult.

Jason Alexander

It’s likely you know Jason Alexander for his role as George Costanza onSeinfeld.

Criminal Minds Aaron Paul

He also appeared as an UnSub, Henry Grace, onCriminal Mindsin Season 4.

A narcissistic psychopath, he turned himself in to Reid and Rossi after they spoke to a college class.

He challenged the team to find five victims before it was too late and they died.

Criminal Minds Robert Englund

Henry thought in doing so, he would prove he was better than they were.

Unfortunately, his appearances onCriminal Mindswere the opposite.

He was entertaining in the role, but it was a dark one.

Criminal Minds James Van Der Beek

He played the ominous UnSub Billy Flynn, a serial killer in two episodes.

He played John Curtis in the Season 8 episodes, “Brothers Hotchner” and “The Replicator.”

Curtis was the answer of the season-long mystery of the UnSub and stalker of the BAU, the Replicator.

Criminal Minds Cameron Monaghan

He was also responsible for killing Erin Strauss, the BAU Section Chief.

The 11th episode of Season 4, “Normal,” featured a couple of notable guest stars.

Bellamy Young

You likely know Bellamy Young for her role as Mellie Grant onScandal.

Criminal Minds Jason Alexander

Maybe you saw her in several episodes ofCSI: MiamiorScrubs.

However, she also appeared in seven episodes ofCriminal Minds, in Seasons 7 and 8.

She recurred as Beth Clemmons, a love interest of Thomas Gibson’s Aaron Hotchner.

Criminal Minds Tim Curry

She played Izzy Rogers, a psychopathic killer, bomber, and bank robber.

NEXT:15 Secrets Behind Criminal Minds You Had No Idea About

Criminal Minds Mark Hamill

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Criminal Minds Bellamy Young

Criminal Minds Tricia Helfer

Criminal Minds