One Direction: They Can Sing, But Can They Act?

The band will make their acting debut on 'iCarly' Saturday, the same night they take the 'SNL' stage.

One Direction fans, get ready, because you are about to get a double dose of the boy band this Saturday night. The British pop sensation will take the stage as the musical guest on "Saturday Night Live" and will also make their television acting debut on Nickelodeon's "iCarly."

Fans have been patiently waiting for the special episode, "iGo One Direction," since it was taped in January. MTV News visited the set of "iCarly" recently to talk to the cast about their exciting guest stars.

Noah Munck, who plays Gibby, gave us a preview of what will happen on Saturday's show, including One Directioner Harry Styles catching a disease called "jungle worms" from Carly. "Gibby is a huge fan of One Direction, he screams like a little girl every time they come in the room, so that definitely was a fun episode to shoot," Munck said.

And in terms of their acting abilities, it seems like the One Direction boys got rave reviews from the cast. "Having One Direction on set was really cool, we didn't really know what to expect from them, because we had heard that they didn't really have any acting experience because they have a lot of lines and are almost in every scene. So we were uncertain as to how well the shooting would go," Nathan Kress said. "But we were all very pleasantly surprised they did very, very well, especially Harry, because he had to pretend to be sick the whole time. ... It was cool, just seeing the five of us mesh with the five of them."

In addition to adjusting to five new people on set, the "iCarly" cast also had to deal with the hundreds of screaming fans who waited outside the show for hours hoping to catch a glimpse of the 1D boys.

"It was a crazy day here," Munck said. "Along the fence of our studio was like maybe 200 screaming girls. I'm like, 'Oh are they here for me?' No, they're here for the band. I hear they tried to push the gates down to get in. It got intense."

Yet, the biggest 1D fan of them all might just be the star of "iCarly" herself, Miranda Cosgrove.

"I've known about them for probably the last two years, so I liked them a lot," Cosgrove said, saying she first discovered the band watching the U.K.'s "The X Factor." "I was really excited to have them on the show. Every one of them was really funny and they all knew their lines and I think they have very good chemistry and they seem like really good friends."

"iCarly" airs Saturday at 8 p.m. ET/PT on Nickelodeon.

Will you be watching One Direction on "iCarly"? Let us know in the comments.