The five best theories that open up Naoki Urasawa's Monster. The anime and manga leave a lot to explain and there's a lot of fringe theories out there. Some, however, are better than others and these are the best five out there.

Timestamps:
0:00 Introduction
0:33 All For Nina
2:26 Reuniting the Children
6:06 The Three Frogs Experiment
8:25 Johan Johan
10:51 Monster Nina


Other Links:
Curious about Another Monster?
   • Another Monster: The Sequel Novel  

More unsettling children's books from Monster:
   • The Awakening Monster  


Cheer, Cheer.