Once Huey and Siria have reappeared at the bottom the screen, they will start moving forward once again, as the stage's main theme starts to be heard from the Yamaha YM-2151 and three Ghosts materialize in front of you before flying directly towards you; once you have shot an Orange (or Level-2, or Level-1) flame at each of these to kill them, seven more Ghosts will materialize in front of you, and fly directly towards you. Once you've shot an Orange (or Level-2, or Level-1) flame at each of them to kill them, the second wall on the right side of the screen will extend (and the second wall on the left side of the screen will recede), as eight Mini Flyers come flying towards you from that right side of the screen, while firing projectiles at you - and once you've shot an Orange (or Level-2, or Level-1) flame at each of these to kill them, you will come to an Enormous Sasori, who is firing projectiles at you from his position on the left side of the screen. Once you have dropped enough bombs upon him to kill him, you will come to a Green Egg on the right side of the screen; once you've dropped a bomb upon it, to destroy it, a green orb with a wing print on it will come flying out of it, towards Huey and Siria. Once you have collected it, Huey (or Siria) will turn green as it takes its effect upon him - and eight more Mini Flyers will then come flying towards you from the left side of the screen while firing projectiles at you. Once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, three more Ghosts will materialize in front of you and fly directly towards you; once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, the fifth wall on the left side of the screen will extend and the fifth wall on the right side of the screen will recede as seven more Ghosts materialize in front of you and fly directly towards you. Once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them four Cockroaches will come walking towards you in the centre of the screen while sending miniaturized versions of themselves flying off up to you (which can be killed for 50 extra points apiece) - but once you have dropped enough bombs on each of them to kill them, you will come to an Orange Egg in the centre of the screen. Once you have dropped a bomb upon it to destroy it, an orange orb with a clawprint on it will come flying out of it towards Huey and Siria; once you have collected it, it will again take its effects on Huey (or Siria - and it will also turn them back to its colour if they had collected that green orb earlier). Ten more Ghosts will then materialize in front of you and fly directly towards you; once you've shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, you will come to two more Enormous Sasori who are firing projectiles at you from their positions in the centre of the screen. Once you have dropped enough bombs on both of these to kill them, eight more Mini Flyers will come flying towards you from the left side of the screen, while firing projectiles at you - and once you've shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, you will come to another Orange Egg in the centre of the screen. Once you have dropped a bomb on it to destroy it, another orange orb with a clawprint on it will come flying out of it towards Huey and Siria; once you have collected it, it will once again take its effect on Huey (or Siria - and it will again also turn them back to its colour, if they had collected that green orb earlier). You'll then come up to eight Medusa Nests in the centre of the screen, that are sending Medusa flying up to you; once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of the Medusa to kill them and dropped enough bombs on each of the Medusa Nests to destroy them, ten more Ghosts will materialize in front of you then fly directly towards you. Once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, two Skulls will emerge from two holes in the ground upon the left and right sides of the screen, then spit three spreading projectiles from their mouths at you - and once you have shot a Green (or Orange, or Level-2, or Level-1) flame at both of their heads to destroy them their bodies will retreat back into the holes. Two more Cockroaches will now come walking up towards you in the centre of the screen, while sending miniaturized versions of themselves flying up to you (which can, again, be killed for 50 extra points apiece); but once you have dropped enough bombs on both of them to kill them, two more Skulls will emerge from two more holes in the ground, and spit three spreading projectiles from their mouths at you. Once you have shot off Green (or Orange, or Level-2, or Level-1) flame at both of their heads to destroy them, their bodies will retreat back into the holes - and you will then come to another Green Egg, in the centre of the screen. Once you have dropped a bomb on it to destroy it, another green orb with a wing print on it will come flying out of it towards Huey and Siria; once you've collected it, it will yet again take its effects on Huey (or Siria - and it will once again also turn them back to its colour, if they had collected either of those two orange orbs earlier). Ten more Ghosts will then materialize in front of you and fly directly towards you; once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, four Swallows will come flying towards you from the top of the screen while firing bomb down at you (which can be destroyed for 50 extra points apiece). Once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of these to kill them, the thirteenth wall on the right side of the screen will extend (and the thirteenth wall on the left side of the screen will recede) as two more Skulls emerge from two more holes in the centre of the screen and spit three spreading projectiles from their mouths at you. Once you have shot a Green (or Orange, or Level-2, or Level-1) flame at both of their heads to destroy them, their bodies will retreat back into the holes; ten more Ghosts will then materialize in front of you, and fly directly towards you. Once you've shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them you will come to a third Orange Egg upon the left side of the screen - and once you have dropped a bomb upon it to destroy it, a third orange orb with a claw print on it will come flying out of it towards Huey and Siria. Once you have collected it, it will for fifth time take its effect on Huey (or Siria; and it will yet again also turn them back to its colour, if they had collected either of those two green orbs earlier). A seventh Skull will then emerge from a seventh hole on the left side of the screen, then spit three spreading projectiles from his mouth at you - and once you have shot a Green (or Orange, or Level-2, or Level-1) flame at his head to destroy it, his body will retreat back into the hole. A Ball (that is flashing) will then come flying towards you on the right side of the screen; once you have shot a Green (or Orange, or Level-2, or Level-1) flame at it to kill it, it will send a randomly-generated powerup flying towards Huey and Siria. Once you have collected it, it will take its effects on Huey (or Siria) - and you will then come to a third Green Egg upon the right side of the screen. Once you have dropped a bomb on it to destroy it, a third green orb with a wing print on it will come flying out of it towards Huey and Siria; once you have collected it, it will for sixth time take its effect upon Huey (or Siria - and it will, for a fifth time, also turn them back to its colour if they had collected any of those three orange orbs ealier). An eighth Skull will then emerge from an eighth hole upon the right side of the screen and spit three spreading projectiles from his mouth at you; once you have shot a Green (or Orange, or Level-2, or Level-1) flame at his head to destroy it his body will retreat back into the hole. Eight more Mini Flyers will then come flying toward you from the right side of the screen while firing projectiles at you - and once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, the nineteenth wall on the left side of the screen will extend and the nineteenth wall on the right side of the screen will recede, as thirty more Ghosts materialize in front of you and fly directly towards you. Once you have shot off a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, you will come to a Blue Egg on the left side of the screen; once you have dropped a bomb on it to destroy it a blue orb with a trident on it will come flying out of it towards Huey and Siria. Once you have collected it for the extra points, you will come to a fourth Enormous Sasori who is firing projectiles at you, from his position in the centre of the screen - and once you have dropped enough bombs on him to kill him, the twenty-second wall on the right side of the screen will extend (and the twenty-second wall on the left side of the screen will recede) as three more Balls (the fourth one flashing) come flying towards you, from the top of the screen. Once you have shot off Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, the fourth one will send another randomly-generated powerup flying towards Huey and Siria; once you have collected it, it will again take its effects upon Huey (or Siria). Ten more Ghosts will then materialize in front of you and fly directly towards you - and once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, you will come to a fourth Orange Egg upon the right side of the screen. Once you have dropped a bomb on it to destroy it, a fourth orange orb with a clawprint on it will come flying out of it towards Huey and Siria; once you've collected it, it will for the seventh time take its effect on Huey (or Siria - and it will for a sixth time turn them back to its colour, if they had collected any of the three green orbs earlier). Two more Skulls will then emerge from two more holes in centre of the screen, and spit three spreading projectiles from their mouths at you; once you've shot off a Green (or Orange, or Level-2, or Level-1) flame at both of their heads to destroy them their bodies will retreat back into the holes. Ten more Ghosts will then materialize in front of you and fly directly towards you - and once you've shot a Green (or Orange, or Level-2, or Level-1) flame at each of these to kill them, two more Skulls will emerge from two more holes in centre of the screen and spit three spreading projectiles from their mouths at you. Once you have shot a Green (or Orange, or Level-2, or Level-1) flame at both of their heads to destroy them, their bodies will retreat back into the holes; thirty more Ghosts will now materialize in front of you, then fly directly towards you. Once you have shot off Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, you will come to four more Medusa Nests on the right and left sides of the screen which are sending Medusa flying up to you - and once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of the Medusa to kill them and dropped enough bombs on each of the Medusa Nests to destroy them, ten more Ghosts will materialize in front of you, and fly directly towards you. Once you have shot a Green (or Orange, or Level-2, or Level-1) flame at each of them to kill them, the main theme that you were hearing from the Yamaha YM-2151 will fade out, as Huey and Siria come to sleeping Alien King (who's dropping five more Medusa Nests onto the ground from his tail) and stop moving forward for a third time in the game.
The game's third boss theme will then start to be heard from the Yamaha YM-2151 as Alien King wakes up and starts flying randomly around the screen while spitting bubbles at you from his mouth; his head is his only vulnerable point, and while Huey and Siria are spitting Green (or Orange, or Level-2, or Level-1) flames at it to weaken him, the five Medusa Nests that he has dropped onto the ground will be sending more Medusa up to them. As mentioned above, the Medusa can be killed for 50 extra points apiece - but once you have dropped enough bombs on one of the Medusa Nests to destroy them, he will drop a replacement one onto the ground from his aforementioned tail, which means that you will never be able to escape the combined wraths of five Medusa Nests until you have shot off enough Green (or Orange, or Level-2, or Level-1) flames at his aforementioned head to defeat him. However, once you have done so, he (along with all remaining Medusa and the Medusa Nests) will explode, and Huey and Siria will then proceed onto that fourth stage.