Official Descriptions For The January 4 Episodes!

Two episodes of Heroes air back-to-back on January 4, effectively making a "two-hour episode."

Here are the official descriptions from NBC. Be warned, some spoilers may follow.

"HEROES" RETURNS WITH A SPECIAL TWO-HOUR EPISODE - THE SEARCH FOR ANSWERS INTENSIFIES AS FINAL RESPECTS ARE PAID TO A FALLEN HERO - RAY PARK, DAWN OLIVIERI, DAVID H. LAWRENCE XVII AND ELISABETH ROHM GUEST STAR - As Claire (Hayden Panettiere) becomes immersed into the world of the Carnival, she becomes increasingly suspicious of Samuels (Robert Knepper) motives. Hiro (Masi Oka) is on a mission to rescue one of his own, but has difficulty communicating his intentions to Ando (James Kyson Lee). Samuel has his sight set on Emma (guest star Deanne Bray) and her ability to complete his master plan. Meanwhile, Sylar (Zachary Quinto) returns to the Carnival in search of answers and Peter (Milo Ventimiglia) continues to struggle with the loss of his brother. Elsewhere, H.R.G. (Jack Coleman) sets his plan in motion to take down the carnival. Cristine Rose also stars. Posted on HeroSite.net. Todd Stashwick, Saemi Nakamura, Sasha Pieterse and Dawn Lyen Gardner also guest star.

Read some spoilers!