This show (aka The New Invaders) is a two-part television miniseries revival based on the 1967-68 original series The Invaders. Scott Bakula starred as Nolan Wood, who discovers the alien conspiracy, and Roy Thinnes from the original series appears very briefly as David Vincent, now an old man handing the burden of stopping the aliens over to Wood.
In on scene a cop says this David Vincent has been chasing the aliens for 20 years.
The premise was used as the basis for a four-hour television miniseries on Fox. The first part aired on November 12, 1995; part 2 aired on November 14, 1995 (both in two-hour time slots). The miniseries has been released in some countries on home video, edited into a single movie.
This mini-series serves as both a reboot of and a sequel to The Invaders (1967), as well as a TV pilot for a full length series that never happened.
There are two versions of the show - the original TV version where the aliens never show their true form and the latter DVD version where they do.