Heroes: String Theory (air date 4/30/2007)

Hiro and Ando find themselves five years after the destruction of New York City. People with extraordinary abilities are labeled as terrorists and are being registered, hunted, and killed. Hiro and Ando meet up with darker versions of the other heroes in preparation for a showdown with the President. This includes a darker side of Matt, a Jessica/Niki with a clear winner in their battle, a brown-haired Claire, and a man named Andy, who's a big hearted Texan. It also features an event at an upscale gentleman's club.

Lost: D.O.C. (air date 4/25/2007)

Sun allows Juliet to examine her when she learns that all of "The Others'" pregnant women died before they gave birth on the island. Meanwhile, Desmond and an unlikely nemesis collaborate to save a new island inhabitant's life.

Heroes: .07% (air date 4/23/2007)

Sylar and Peter face off. Sylar will face off with another Hero and Isaac's new pictures show a dead Hero without a brain. Two unexpected reunions will occur and Linderman will reveal to Nathan shocking secrets and plans. We will meet a computer savvy geek and a competent security guard who works in the Corinthian Casino and Hotel in Las Vegas. A hero dies.

Lost: Catch-22 (air date 4/18/07)

Desmond convinces Hurley, Jin, and Charlie to follow him on a trek through the jungle. Flashbacks reveal more of Desmond's Army career. Meanwhile, a despondent Kate turns to Sawyer after seeing Jack and Juliet together.

Lost: One of Us (air date 4/11/07)

The celebration of Jack's return is cut short when he arrives at the beach with an Other, Juliet, whose flashbacks pick up from where they left off, showing us how she got onto the island and became an Other. Meanwhile, Claire is threatened by a strange illness.

Lost: Left Behind (air date 4/4/07)

Kate and Juliet are stranded in the jungle after Kate learns that there is a traitor in the survivor's midst. Meanwhile, Sawyer's poor attitude and selfish ways towards the beach community may earn him a vote of banishment if he doesn't have a change of heart.