AS MATT AND SURESH FACE GRAVE DANGER, THE SCANDALOUS TRUTH ABOUT CLAIRE'S REAL FATHER IS REVEALED -- CHRISTOPHER ECCLESTON ("DR. WHO") AND JESSALYN GILSIG ("NIP/TUCK") GUEST STAR -- While the scandalous truth about Claire's real father is revealed, her adoptive mother (guest star Ashley Crow) faces a crisis. Matt (Greg Grunberg) takes a job as a bodyguard for a crooked attorney (guest star Aron Malsky), which puts him in the crosshairs of Linderman's new assassin. Hiro (Golden Globe nominee Masi Oka) and Ando (guest star James Kyson Lee) return to Las Vegas to find the sword, but get sidetracked by a damsel in distress (guest star Missi Pyle). Suresh (Sendhil Ramamurthy) finds someone on the list and unknowingly puts himself in grave danger. Meanwhile, Simone (Tawny Cypress) turns to some unlikely help in her and Nathan's (Adrian Pasdar) struggle to find Peter (Milo Ventimiglia). Santiago Cabrera, Noah Gray-Cabey, Ali Larter and Leonard Roberts also star. Jessalyn Gilsig, Jimmy Jean-Louis, Lisa Lackey, Zachary Quinto and Cristine Rose guest star.

I had put the description here since, as an unaired episode, its description would contain spoilers. At least, that's how I thought the set-up was supposed to be.

I hate myself for reading all these spoilers but I can't help myself, thanks for putting up the episode summary

Airdate: February 12, 2007

01/31 - According to Kristin from E!, Claire's father also has an ability. Source: SpoilerFix BuddyTV Spoilers Chat
01/26 - While the scandalous truth about Claire's real father is revealed, her adoptive mother faces a crisis. Matt takes a job as a bodyguard for a crooked attorney (guest star Aron Malsky), which puts him in the crosshairs of Linderman's new assassin. Hiro and Ando return to Las Vegas to find the sword, but get sidetracked by a damsel in distress (guest star Missi Pyle). Suresh finds someone on the list and unknowingly puts himself in grave danger. Meanwhile, Simone turns to some unlikely help in her and Nathan's struggle to find Peter. Santiago Cabrera, Noah Gray-Cabey, Ali Larter and Leonard Roberts also star. Jessalyn Gilsig, Jimmy Jean-Louis, Lisa Lackey, Zachary Quinto and Cristine Rose guest star. Source: NBC
01/22 - Ali also talked about her character's involvement with the older Petrelli brother, "I don't know much, other than at the end of episode 15, there is a reason as to why we are going to be together again. Source: Kristin on E!Online
12/13 - The other unit is shooting day 3 of episode 15 – scenes involving new disturbing developments at Claire’s house – and later a scene set backstage involving Hiro, Ando and chorus girls. Source: Beaming Beeman
Source - Spoilerfix

Episode Description
AS MATT AND SURESH FACE GRAVE DANGER, THE SCANDALOUS TRUTH ABOUT CLAIRE'S REAL FATHER IS REVEALED -- CHRISTOPHER ECCLESTON ("DR. WHO") AND JESSALYN GILSIG ("NIP/TUCK") GUEST STAR -- While the scandalous truth about Claire's real father is revealed, her adoptive mother (guest star Ashley Crow) faces a crisis. Matt (Greg Grunberg) takes a job as a bodyguard for a crooked attorney (guest star Aron Malsky), which puts him in the crosshairs of Linderman's new assassin. Hiro (Golden Globe nominee Masi Oka) and Ando (guest star James Kyson Lee) return to Las Vegas to find the sword, but get sidetracked by a damsel in distress (guest star Missi Pyle). Suresh (Sendhil Ramamurthy) finds someone on the list and unknowingly puts himself in grave danger. Meanwhile, Simone (Tawny Cypress) turns to some unlikely help in her and Nathan's (Adrian Pasdar) struggle to find Peter (Milo Ventimiglia). Santiago Cabrera, Noah Gray-Cabey, Ali Larter and Leonard Roberts also star. Jessalyn Gilsig, Jimmy Jean-Louis, Lisa Lackey, Zachary Quinto and Cristine Rose guest star.

I feel guilty now...

So the official description I put up was deleted in favor of the mod's topic? Huh.

Well your description would have been deleted because it was in the wrong section and so just to keep things organized it was taken down. Don't be offended it's just how the forum works

Yeah, okay... weird. It was in the same section as where dommodguy has his/hers pinned...

Oh man I'm so excited to see how they'll play out the whole Nathan as Claire's father thing, I didn't think it would work initially but I'm sure the writers will prove me wrong

This episode suked...I didnt like it a bit..

It wasn't that bad it offered some details on Claire's life but other than that it wasn't one of the best episodes that they've had

Episode 15 was a drag....Nothing significant was revealed. Why are the heroes developing the powers here??? I was watching earlier episodes..and wtf??? a mathematical formula to find people with altered genes?? how does that happen??? nywayz...Atleast we no what Niki and Jessica are goin to stand at when the big separation of good versus bad starts...I think she will be like raven from teen titans..switching back and forth... Im still confused about peters powers. Does he emit the powers only when he is around others or does he retain them or does he reproduce them whenever they are using them??? This is really confusing and annoying now...Peter can also see the future and in the comics he sees the future of him flying and taking down bad guyz

When Peter is around others with abilities he is able to "absorb" their powers sort of like Rogue from X-Men except Peter doesn't have to have physical contact and he also does not suck the life force out of the person with the ability. Once Peter can learn to control his power he is able to then draw out the power of the person that he was around before. Like in episode 14 when Claude pushed Peter off the building and Peter landed on the taxi he was then able to recall Claire's power and heal himself.