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The Index is the tenth episode of the fourth season of Alias, and the seventy-sixth episode overall.
Starring: Jennifer Garner (Sydney Bristow), Ron Rifkin (Arvin Sloane), Michael Vartan (Michael Vaughn), Carl Lumbly (Marcus Dixon), Kevin Weisman (Marshall Flinkman), Mia Maestro (Nadia Santos), Greg Grunberg (Eric Weiss)
Special Guest Star: Angela Bassett (Hayden Chase)
- Behind the CIA's back, Sloane managed to obtain a decoder to read something called the Blackwell Index, which contains incriminating evidence on government officials. Apparently Jack is aware of this and they seem to need something specific from it.
- While visiting his comatose uncle, a nurse mentions they he spoke about Vaughn's father and gives him an envelope from the uncle, meant for him that contains a key. Vaughn uses it to open a locker in a Mesa bus station and finds a diary with entries dating to 1982, three years after he died. He returns to the hospital to ask for the same nurse named Rosemary, but is told no one by that name works there.
- Dixon and Chase subtly flirt.