RUSSELL QUESTIONS THE CIRCUMSTANCES SURROUNDING THE SHOOTING DEATH OF A FELLOW WORKER AT UNDERLAY'S HANDS, ON ABC'S "INVASION"

"Unnatural Selection" - Russell questions the mysterious circumstances surrounding the shooting death of a fellow worker at Underlay's hands. Meanwhile, Larkin becomes suspicious of an old flame's motives after he invites her to visit his military base, Mariel begins to worry that she hasn't been a good mother to her children since the hurricane -- and she also wonders what Father Scanlon's intentions are when he invites her to attend his church survivor's group -- on "Invasion," WEDNESDAY, OCTOBER 19 (10:00-11:00 p.m., ET), on the ABC Television Network.

"Invasion" stars William Fichtner as Sheriff Tom Underlay, Eddie Cibrian as Russell Varon, Lisa Sheridan as Larkin Groves, Kari Matchett as Dr. Mariel Underlay, Tyler Labine as Dave Groves, Evan Peters as Jesse Varon, Ariel Gade as Rose Varon, Alexis Dziena as Kira Underlay and Aisha Hinds as Mona Gomez.

Guest starring are Nathan Baesel as Sirk, Matt Ross as Vince Teracoma, Sylva Kelegian as Lucy McKittrick, Ivar Brogger as Father Scanlon, Veronica Cartwright as Valerie Shenkman, Jake Richardson as Gage, Stephen Lee as Carl McKittrick, Michael Mitchell as Derek Culie, Robert Dickenson as newscaster, Jake Eberle as man, Alexis Ryan as woman, Saida Rodriguez Pagan as newscaster no. 1, Reggie Jordan as newscaster no. 2 and Matt Sigloch as MP.

"Unnatural Selection" was written by Michael Berns & Shaun Cassidy and directed by Thomas Schlamme.

"Invasion" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound and Spanish subtitles via secondary closed captioning.

A TV parental guideline will be assigned closer to airdate.