Roswell - Season 2 - Eps 21: The Departure
Max, Isabel, Michael and Tess struggle with goodbyes on what they believe to be their last night on Earth before they travel back to their home planet. In the final hours, Max frantically searches for the killer that is still out there and threatens the lives of everyone they love.
About Roswell

Title: Roswell
First Air Date: 1999-10-06
Last Air Date: 2002-05-14
Status: Ended
Rating: 7.692/10 (from 450 votes)
Language: EN
Seasons: 4
Total Episodes: 61
Network: The WB UPN
Genres: Sci-Fi & Fantasy, Drama
Production Companies: Jason Katims Productions, Regency Television, 20th Century Fox Television
Synopsis
Bizarre things start happening in the little New Mexico town where UFOs were spotted in 1947. Cut to 1999, when a cute high-school student saves the life of a teenage waitress. Surrounded by cliques of clever, angst-filled classmates, the two form a bond that threatens the survival of a secret universe involving superhuman powers, a yen for hot sauce and an alien gene pool.
Cast

Shiri Appleby
Liz Parker

Jason Behr
Max Evans

Katherine Heigl
Isabel Evans

Majandra Delfino
Maria DeLuca

Brendan Fehr
Michael Guerin

Nick Wechsler
Kyle Valenti

Adam Rodriguez
Jesse Ramirez

William Sadler
Jim Valenti