Gatchaman Eternal

The Team searches for Zed in his tower, and are thrown around like playthings. When they finally meet up, they discover what happened to Egobossler: his corpse is pinned against a wall in Zed's main chamber, run through by his own sword. At this point, Joe picks up on Zed's vital signs (as Rafael had designed him to) and tracks the alien to his last refuge, where the Kagaku Ninjatai battle to destroy him... and fall. Chief Nambu's mysterious pendant (an unanalyzed device he'd instructed Kamo to give to the Team before the last battle) comes into play then, activating the Gatchaspartan and swallowing the fallen ninjas with light... The final scene is of an enormous firebird breaking free of Zed's exploding tower and flying around the Earth, leaving us to analyze the wide open ending. (Chances are high, though, that they aren't dead--they're still under contract, after all.)