Tahmoh Penikett to Guest Star on Special Criminal Minds Episode

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Tahmoh Penikett will help Criminal Minds celebrate a milestone.

The former Battlestar Galactica star, who played a key role early on Supernatural Season 9, will appear on the CBS drama's 200th episode, producer Rick Dunkle confirmed this week via the following Instagram photo:

Tahmoh Penikett on Criminal Minds Set

According to TV Line, Penikett will portray Michael Hastings, an unwelcome  blast from JJ's past from her days at the DoD.

Look for the special episode to focus on JJ's time away from the BAU, answering questions raised this year by Esai Morales' Mateo Cruz.

Penikett has also appeared on Continuum, Castle and The CW’s upcoming Star-Crossed.

You can watch Criminal Minds online now in preparation for tonight's 199th installment, which airs at 9/8c on CBS.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Criminal Minds Quotes

Hotch: A sniper can wait up to 72 hours without sleeping.
Mays: Seriously?
Rossi: That's part of their training. They can stay awake for 72 hours and remain completely focused on their target.
Mays: How?
Hotch: By using a mental exercise called "fantasy integration". A sniper creates a scenarios involving a target that keeps that person at the forefront of their mind.
Morgan: Often they'll imagine a place where they're with the target, doing something together that takes time. For example, building a car.
JJ: For some, the fantasy begins the minute they're assigned a target. Then nothing will distract them.

Reid: There's an old Buddhist saying that, when you meet your soulmate, remember that the act to bring you together was 500 years in the making. So always appreciate and be kind to each other.
Lewis: That's lovely.
Reid: There's a corollary for friends. When you meet a true friend, you will be bound together though space and time for 500 years.