11/23/2009 (08:00PM - 09:00PM) (Monday) : THANKSGIVING UNITES FAMILIES TOGETHER AND BRINGS NEW REVELATIONS - H.R.G. (Jack Coleman) hosts an untraditional Thanksgiving dinner. Elsewhere, the Petrelli family gets a surprise guest at their table. Meanwhile, Samuel (Robert Knepper) continues to hold Hiro (Masi Oka) hostage, as Lydia (guest star Dawn Olivieri) goes in search for the truth. Greg Grunberg, Hayden Panettiere, Adrian Pasdar, Zachary Quinto, Sendhil Ramamurthy, Cristine Rose and Milo Ventimiglia also star. Ashley Crow, Jimmy Jean-Louis, Madeline Zima, Ray Park, Harry Perry, Elizabeth Rohm, Andrew Connolly also guest star.