Adapting the award-winning DC Comics miniseries DC: THE NEW FRONTIER by Darwyn Cooke, Justice League: The New Frontier spins a tale of the DC Universe in the 1950s, focusing on test pilot Hal Jordan (Green Lantern) and the Martian Manhunter.
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2-3. I'd say it's marginally better than the average DC animated movie in that it specifically designates two characters to develop (Hal Jordan and Manhunter), as well as the way it rightly draws correlations between the boom in alien invasion flicks with racial tensions and the 'red scare'. That being said, the plot, itself, is generally average fare that doesn't leave a lot of room for pacing. But it's still fine.