S1, E16: Peter (Milo Ventimiglia) painfully learns that someone close may have betrayed him and Claude (guest star Christopher Eccleston). Matt’s (Greg Grunberg) world spirals out of control when radioactive man Ted Sprague (guest star Matthew John Armstrong) and Hana Gitelman (guest star Stana Katic), a fierce young woman with "wireless" mental abilities, drop into his life. After blood is spilled, Hiro (Golden Globe nominee Masi Oka) makes a difficult decision about his mission. Claire (Hayden Panettiere) is unable to contain her anger at her father (Jack Coleman).