 If you liked
Schwarzesmarken
|
 ...then you might like
Terra Formars: Revenge
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In the case of Schwarzesmarken, we have the BETAs and human roaches on Terra Formars. Both shows deal with how humanity strives to defeat these monsters to save their own kind. While the main plot is about fighting the monsters, both shows also have twists where the root of the main problem is connected to human politics.
the two have the same plot where the fate of mankind relies on the people fighting a swarm of deadly attackers, however 666 was more of prequel where the people have to defend their mother land, while TFR is more of a group of explorers whom where send to retrieve some of their freak experiment that somehow wouldn't go without a fight...regardless of which both are worth to be watched.