In January of 2010, the Idol-Head asked its readers to vote on the Martian Manhunter villains they felt were the most interesting. For the better part of a year afterword, the site counted down from least to most popular, offering commentary on each selection. However, I found that there were gaps with regard to more in-depth coverage of some of these characters. Further, I found that there's a major difference between bad guys we like, and those that have had a meaningful impact on the publishing life of the Manhunter from Mars. Hoping to ease problems in both departments, I compiled a list of ten foes I felt had been the most significant to date, regardless of personal preferences. I wrote some fairly lengthy analysis of each subject, justifying the choices and ranks through historical and thematic impact, comparisons with other characters, plus oodles more.