While I like "Tales of Tomorrow" episodes and strongly recommend you download them (FOR FREE) at archive.org, I must admit that "Sneak Attack" is an excruciatingly bad installment in the series. It's just very badly written and preachy...VERY preachy.
The show begins in a hospital in enemy territory in 1960. Who the enemy is isn't stated--but it's obviously meant to be the forces of Communism--and most likely the USSR. An American (Zachary Scott) has been shot but why he's there and the enemy's intentions are unknown.
Soon, the plot abruptly changes...very abruptly. Enemy airplanes, designed to look exactly like American ones, appear across the US and land on runways in various large cities. The planes are remote controlled and when authorities try to open one up, it explodes and destroys Denver!! How can Scott help out in these devious plan--even though he's stuck behind enemy lines?! And, more importantly, who cares?! The biggest problem with this show is that it's not at all subtle and is pure propaganda. Now I am not saying that the USSR was not a serious threat at the time, but here they aren't even human and the film never is enjoyable or well written...it's just dumb!