Hyper Great Thing is the boss of Zone K from Darius Twin. It is shaped after a sperm whale.
Gameplay
Hyper Great Thing is essentially the same as the regular Great Thing. The main difference, however, is that since the game uses a much smaller screen resolution the boss is fought as a battleship raid, where you circle around it as he moves around, destroying each of the many weapons covering it's body. Once all weapons are taken out you can finally face it's head, with his weakpoint being in the mouth as expected.
Gallery
Full body view
As seen in Darius Twin in Zone K (Screen Cap taken by Tar-Palantir)