Roswell, New Mexico S04e04 〈Essential〉

You can find more detailed breakdowns on sites like Nerds and Beyond and Showbiz Junkies.

: Michael continues trying to infiltrate the "Dark Triad" (Bonnie and Clyde). Bonnie reveals that the alien relics they are collecting are pieces of a device designed to take them back to Oasis—a device originally built by Michael's mother, Nora . Roswell, New Mexico s04e04

Roswell, New Mexico Season 4 Episode 4 Recap: “Dear Mama” You can find more detailed breakdowns on sites

: The primary antagonist, Tezca , is revealed to be a powerful alien shapeshifter. She uses her abilities to impersonate Jenna Cameron and leads Max toward Jones's body in the desert. Max eventually realizes the deception when "Cameron" begins asking suspicious questions about Liz and displays an alien tattoo. Roswell, New Mexico Season 4 Episode 4 Recap:

: Seeking honesty in her grief, Isobel attempts to confess her feelings and identity to Anatsa . However, Anatsa ends their relationship, citing that it has become too complicated.