Neil Patrick Harris is not coming to the "Freak Show" alone!

Earlier this month, "American Horror Story" co-creator Ryan Murphy announced that Harris will appear in at least two episodes of the show's current season, but it turned out that he is not the only one who is making an appearance, as his real-life husband David Burtka is also set to guest-star on the hit FX anthology series.

The 41-year-old "Gone Girl" star will play a chameleon salesman in episodes 11 and 12 of "Freak Show," while Burtka, 39, will make an appearance in the season finale (Episode 13) in a sexy storyline with Jessica Lange's Elsa Mars," TVLine reported.

Just days before the fourth installment premiere of the Primetime Emmy-winning show, Murphy told a group of reporters that Harris is "game" to make an appearance on the horror series. 

"He had very specific ideas of what he wanted to do, and I had very specific ideas, so we're melding them, Murphy said, as quoted by E! News. "He's awesome... I would love to see him and Jessica Lange go at it in some intriguing way. Because of his schedule, something we're thinking about, maybe one episode and then another one later on."

But do you know that Harris and Burtka could have been part of the original cast members of the series if only they did not turn down a previous offer to appear on the show's first installment subtitled "Murder House?"

The "How I Met Your Mother" alum stopped by Entertainment Weekly Radio on Sirius XM on Oct. 16 and revealed that Murphy asked them to play a couple in the show's first season.

But the two had just portrayed a dysfunctional "couple" in the 2011 3D stoner comedy film "A Very Harold and Kumar 3D Christmas," and Harris did not want to play the same roles twice, so they refused to play the roles, which eventually went to Zachary Quinto and Teddy Sears.

"Right after that [Christmas film], we were asked to be in season one of this great new show called 'American Horror Story,' revealed the five-time Primetime Emmy winner to  EW editor Matt Bean. "And the idea was that we would be a gay couple, that, as it turns out, were murdered in this house and then our ghosts are around for the thing."

"It seemed cool," he said of the project. "Loved Ryan, loved the idea of a horror anthology show. Knew nothing about it, but we had just played ourselves as a couple, not getting along, and I thought, it just seems weird to do that twice, like as individual actors, to play a couple that hates each other twice. It just felt weird."

"So I said no, that we shouldn't do it. And David wanted to. I said, 'I just don't want us to be known as a couple that don't like each other,'" he explained. "And then wouldn't you know, 'American Horror Story' is a big, gigantic success and super awesome."