How to unlock Kang and Kodos

GamerGD3 wrote:
Halloween 2012: Kang was 150 (was reduced to 100) donuts + raygun (x2 - 1 damaged, 1 new)
Halloween 2013: (if Kang unowned) Kang was free with Victorian UFO / Kodos was 150 donuts
Halloween 2013 (if owned Kang) - Kodos was free - shot down with spare raygun, received a third raygun (pure and had 2 damaged)
Halloween 2014 (if Kang is unowned - free with Make-a-Thing) - couldn't find anything on Kodos

in 2014 it was ray gun for Kodos