Board Thread:Questions and Answers/@comment-99.156.93.92-20151126041139/@comment-8777966-20151126042631

Lure Alien Nyandam closer to your base after killing a lot of the other Alien enemies, and then rush him with a lot of tanky units like jaimera or macho legs. Island and Crazed Whale arent bad here either, and if you can time it well, Castaway/Surfer cat will freeze him, and if you're lucky you'll be able to stack Castaway and freeze Nyandam to death.

Also, should be a given, but make sure you've collected all of the superior treasures from every chapter.