The series had a novel idea, interpret history involving hostile extraterrestrials and the secret government agency fighting them.
This worked quite well. Though, some have criticized the series for styles and music being out of sync with the time periods or other mistakes (one glaring mistake is the footage chosen of a launch of Project Gemini -- shown was a Mercury capsule mounted on a Redstone booster). One has to remember that this was a TV series and as such, was subjected to a tight shooting schedule.
Now, like "The Invaders" (if I recall that series correctly), the major drawback was that the main characters made virtually no progress in their fight against the alien menace. A series needs forward momentum, otherwise the episodes become exercises in futility.
As for the ending episode, even though the series was abruptly canceled, it could have been better. A longer narration could have been added resolving all of the loose threads, e.g. saying Loenguard's son was the aliens big mistake which caused their defeat.
All in all, the series was based on an interesting and intelligent idea and if it had the aforementioned forward momentum, would have been one of the all time classics.
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