Max witnesses a tragedy and is haunted by the ghost of a man he could have saved, leaving him overwhelmed with guilt and questioning his healing abilities. Isabel, aka the Christmas Nazi, tries to brighten up the holiday season, and Tess tries to become a part of the Valenti family.
Duplicate versions of Michael, Isabel, and Tess come to Roswell after killing their King Zan, to urge Max to attend an important interstellar summit in New York City, but they have their own agenda. Meanwhile, Ava stays behind in Roswell.
The Skins make all the humans in Roswell, New Mexico disappear turning it into a ghost town. Their assault ends with the death of one of the aliens: Courtney the helpful Skin. Fortunately Tess uses her mindblowing powers and destroys all the other Skins or so it seems until Max and Tess spy a boy resembling Nicholas on a scooter at the end of the episode.moreless
After the death of Congresswoman Whitaker, Max and the gang visit her hometown, Copper Summit, Arizona, where they find themselves trapped in enemy territory when they learn the entire town population are Skins.
An older Max travels from the future (2014 to be exact) to tell Liz that their relationship will imperil his planet and together they devise a plan to change the future: by making present Max fall out of love with Liz. Not an easy task until Liz tricks Max into believing she slept with Kyle.moreless
Isabel is deeply moved when Max throws her a surprise birthday party, but she grows troubled after seeing visions of a bound and gagged Tess. Meanwhile, Alex does an interesting cop strip tease for Isabel and Congresswoman Whitaker is revealed as both Nasedo's killer and a Skin.