Synopsis by Hal Erickson
The worst has happened: The United States has been invaded and occupied by an unfriendly foreign power. At least, that is what the IMF wants American turncoat Whitmore Channing (Kevin McCarthy) to believe. The purpose of this charade is to prevent Channing from handing over top secret information to the Enemy. The real fun in this episode lies in watching guest star Kevin McCarthy undergo the same paranoia he earlier exhibited in the classic sci-fi film Invasion of the Body Snatchers) (1971). First telecast on November 13, 1971, "Invasion" was written by James L. Henderson and Sam Roeca.