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1x02 - "Don't Look Back"

The episode will introduce 20ish-year-old Eden McKenzie (played by Nora Zehetner), a hip and bohemian struggling actress from New York. Eden will appear in at least three episodes. We will meet Janice Parkman, wife of Matt Parkman (Greg Grunberg). Amongst the other recurring characters who'll be introduced in this episode are: Jackie, a cruel cheerleader from Texas; Brody, the star quarterback at Odessa High, who has a sinister and disturbing allure hiding under the nice fa?ade he projects; Lori, a teen who attends Claire's highschool and who used to be popular until a nasty rumor was spread about her. There will be a murder in this episode and Matt will be grilled about his service record.

Source: spoilerfix

1x03 - "One Giant Leap"

Hiro sets about proving to Ando (James Kyson Lee) that he is meant to save the world; Matt is questioned by FBI agent Audrey Hanson (Clea Duvall) about suspected serial killer Sylar, who Mohinder learns had a connection with his dead father; Peter marvels at his new found ability to fly, while Nathan makes a calculated move to keep the truth from the press. Also, Claire's attempt to maintain normalcy in her life proves difficult; Niki visits Micah's paternal grandmother; Isaac pushes Simone away.

Source: tvguide