For the 2021 TV series, see Invasion (2021 TV series).

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 (by first merging with, then replacing them). 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.

Due to Hurricane Katrina in 2005 and the aftermath in the southern United States, early on-air promotions were quickly pulled by ABC. The advertising then switched emphasis completely to the alien invasion aspect of the series, while the hurricane received no mention. The premiere was also preceded with a warning that the show featured images of a fictional hurricane, to which viewers could be sensitive.

Invasion received critical acclaim, with praise for its acting, writing, direction, and the musical score. However, many viewers decried the show as "agonizingly boring" due to the dull action and slow pace, especially among the first few episodes. The series was canceled on May 17, 2006. Since then, the show has appeared in numerous lists of shows that were "Cancelled Too Soon", including lists by Entertainment Weekly and The Huffington Post. The show was originally conceived for five seasons.