Beckett (Stana Katic) might have to deal with some brutal sexism in the next episode of ABC's Castle.

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Beckett and Castle (Nathan Fillion) will be interrogating a witness names Harold Metzger in the upcoming episode of Castle titled That '70s Show, and it is soon discovered that the witness believes he is still in the '70s.

Therefore, he shares some outdated views on women, according to a new spoiler report by TVGuide.com, which notes that his views are similar to that of Archie Bunker, the agitated, conservative father on the classic '70s sitcom All in the Family.

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Therefore, Castle must take over as the lead of the case, which involves him and the other characters in the 12th Precinct dressing up in '70s garb. This episode is set to air Monday, April 21.

In other Castle spoiler news, the plot synopsis for episode 21 has been revealed. The episode is titled Law & Boarder and features Castle and Beckett investigating extreme sports.

"When an up-and-coming professional skateboarder is gunned down by a mysterious motorcyclist, Castle and Beckett are thrust into the world of extreme sports, where the death defying stunts aren't the only thing that's dangerous," the synopsis reads.

Law & Boarder will air Monday, April 28.

These episodes could be leading up to the big wedding Castle fans have been waiting for, as the season 6 finale is titled For Better or Worse, a probable nod to matrimony.

Castle season 6 airs Mondays at 10 p.m. on ABC.

Watch the promo for the next episode of Castle here:

Tags: Castle television ABC