Liz and Max adjust to the bond developing between them; a suspicious substitute teacher has everyone on edge.

The aliens' vulnerability becomes apparent to Maria; Max takes a job that may help him discover his past.

Liz begs Max to help revive her comatose grandmother, but after Max is thrashed by Kyle's friends, he realises that he must stay away.

Liz panics when she discovers that someone has taken her diary; in art class, Michael comes closer to solving the mystery of the fourth alien.

A haunting vision causes Michael to hit the motorway in Maria's stolen car; a class assignment brings together unlikely pairs.

Liz and Max journey to an American Indian reservation where they glean information from an elderly tribesman about the alien who vanished in 1959.