Bit of a shock this one after just watching Justice League Unlimited. At the start I thought I was watching Samurai Jack. The animation takes a little getting used to, but as a comics fan I soon realised I had a gold nugget here.
The series is set in the mid Fifties at the start of the so-called Silver Age of comics where many of the characters of the Justice League began their careers, and was quite faithful to the comics of the era, with the origins of Green Lantern and J'onn J'onzz being well depicted. It also featured most other characters of that period, most notably for me Ace, from the yet to be formed Challengers of the Unknown, and scientist Ray Palmer as the future Atom.
I also liked the political background in which the story was set, and although not too impressed with the threat itself,there was enough going on and plenty of action for the film to be a satisfying experience.
I would recommend this to any fan of sixties comics. I can see no continuity with the newer series however.