Invasion is an American science fiction television series created by Shaun Cassidy. It originally aired on ABC from September 21, 2005 through May 17, 2006. Somewhat similar to Invasion of the Body Snatchers, the show told the story of the aftermath of a hurricane in which water-based creatures infiltrate a small Florida town and begin to take over the bodies of the town's inhabitants through a cloning process. It stars an ensemble cast featuring William Fichtner, Eddie Cibrian, Kari Matchett, Lisa Sheridan, Tyler Labine, Alexis Dziena, Evan Peters and Ariel Gade. The show was produced by Shaun Cassidy Productions and Warner Bros. Television.

Shaun Paul Cassidy is an American singer, actor, writer, and producer. He has created and/or produced a number of television series including American Gothic, Roar and Invasion. Cassidy was also an executive producer and writer for NBC's medical drama New Amsterdam.