How to unlock Kang and Kodos

thalia0305 wrote:

Actually during 4 July 2015 event, Kang was given free too by doing a quest.

That's how I got Kang. Didn't even know it was anything special then. I just thought it was one of those things FTP games do where they split up a pair and then do one freemium and the other premium so people will pay to get the second one once they've gotten the first for free.