|“||Attack Big Star Brain!||„|
|~ Star Soldier announcer|
The Big Star Brain is the vastly improved model to the normal Star Brain and the primary antagonist of the original Star Soldier. It has a much greater defense, being much larger in comparison to the original and featuring four turrets to defend itself. At the end of Stage 4, 8, 12, and 16, the player must face off against the Big Star Brain and, like the original, defeat it within a time limit before it escapes, sending the player to an earlier checkpoint. It also fires heat seeking fireballs at the player when the player takes longer to defeat it a second time. To destroy the Big Star Brain, the player must first destroy the four cannons on the boss then attack the brain itself.