HEROES: SETH GREEN AND BRECKIN MEYER

They no doubt took pay checks, but Seth Green and Breckin Meyer didn't want to guest-star on NBC's Heroes for the money.

The actors, who have collaborated on Cartoon Network's Robot Chicken, simply wanted to fulfill a genre desire.

"I've asked over and over and over again to be on the show and then eventually I guess I wore them down," Green said.

"I'm a big fan of the show," Meyer said. "I've seen every episode."

The roles -- which are featured in Monday's episode, "The Eclipse -- Part 1" -- came about shortly after Comic-Con International in San Diego last summer, where Green and Meyer were promoting Robot Chicken and Heroes staged a panel, led by recently released co-executive producer Jeph Loeb.

"I have been after Jeph Loeb since the show came on. 'How do I get on that show?'," Green said. "And then he called me and it was like, 'Alright, the time has come.' And he said, 'Do you know anybody, because we've got this other part?' I was like, 'Well Breckin Meyer, to tell you the truth.' And he was baffled. He was like, "Breckin would never do this.' And I said, 'I bet he will. I'll call him.'"

In the episode, Green plays Sam, owner of Sam's Comics, and Meyer plays Frack, his co-hort.

"We sell the 9th Wonders! comic, so we have a unique perspective on the trouble that everybody is in," Green said.

"We're very familiar with the Heroes' plight and story," Meyer said.

"Maybe even have a little bit of additional information," Green added mysteriously.

The arrival of Ando and Hiro at Sam's Comics causes a stir.

"I instantly recognize them," Meyer said. "He doesn't believe they're actually real because we're such fans of the comics."

"It's like Spider-Man walked into the comic shop," Green said. "Oh, let me hang out and chat with Spider-Man."

Green said the comic reveals the right path for Hiro and Ando, and Meyer said that the characters are like "gatekeepers" the 9th Wonders! comics.

This isn't the first Robot Chicken/Heroes pairing. Zachary Quinto, who plays Sylar, provided a voice for a Sylar sketch, and Masi Oka, Milo Ventimiglia and Hayden Panettiere have also contributed to Robot Chicken.

Meyer and Green both said they enjoyed their Heroes experience.

"We've been doing it a while, but one of the great things about our job, we still get to have a lot of fun playing around," Meyer said.

"It's awesome," Green said.

For a preview of the Green/Meyer scene, CLICK HERE.