Epsilon-1 (Japanese: イプシロン-1, Hepburn: Ipushiron-1) is an antagonist and the boss of Stage 16 in Alien Soldier.
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When Epsilon-Eagle was sucked into the time-space continuum during the skirmish between the X-Ages and Scarlet, his being was split into two parasites, known as Epsilon-1 and Epsilon-2.
Epsilon-1 represented the evil half of Epsilon-Eagle, and resided in a man named Tenma Kuroki.