MARIEL IS FORCED TO PERFORM AN ULTRASOUND ON CHRISTINA TO UNCOVER WHAT�S GROWING INSIDE HER, RUSSELL AND DAVE MAKE A DISCOVERY ABOUT THE HYBRIDS, AND JESSE NOTICES SOME STRANGE BEHAVIOR ON HIS FIRST DAY BACK AT SCHOOL, ON ABC�S �INVASION�

�The Key� � Christina forces Mariel to perform an ultrasound to find out what�s growing inside her rapidly expanding womb. Meanwhile, Russell and Dave set out to discover what Healy knew about the hybrids, and Jesse becomes concerned about the odd behavior displayed by some of his classmates after the school is reopened, on �Invasion,� WEDNESDAY, MARCH 15 (10:01-11:00 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, Elisabeth Moss as Christina, Michael Mitchell as Derek, James Frain as Eli Szura, Ron Perkins as man, Tina Holmes as Ms. Wade, Kimleigh Smith as nurse no. 1, Eddie Rutkowski as nurse no. 2, Owen Beckman as Scott, Edwin Hodge as Brett and Jessica Jaques as young woman.

�The Key� was written by Michael Alaimo & Michael Foley and directed by Bryan Spicer.

�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.