Another good one from Martin Mystery (they seem to have a good trend going on with apocalyptic/group TFs).
https://www.youtube.com/watch?v=Fkj1Ozw4N68
This one haunts me even today because of how much bullshit the ending was, seriously the bad guy was THIS close to winning and the human race would be lost (or at least the summer camp). But eh... guess they had to bring it back to the good guys somehow.