Thunder Force - All Boss Themes 

here's another boss theme video on a forgotten series enjoy
Thunder Force NES
00:00 Boss Theme
Thunder Force 2
00:32 ZCS
1:05 Big Elephant
2:03 Gaiya Beast
3:46 Cave Digger
4:39 Humanoid Hunter
5:13 Plealos (Final Boss)
Thunder Force 3/AC + Thunder Spirit
6:11 Gargoyle
8:39 Twin Vulcan
9:49 King Fish
11:18 G-Lobster
12:55 Roll Gunner (Spirit only boss)
13:43 Mobile Fort
14:44 Cerberus
19:58 Defense Satellite (Spirit only boss)
20:55 Base Guarder
22:32 Khaos (Final Boss)
Thunder Force 4
24:19 Gargoyle Diver
26:45 Hell Arm
27:53 Ratt Carry
29:26 Formalhaut
30:39 Versus
31:55 Spark Lancer
33:16 Dust Egg
34:04 Evil Core
34:49 Armament Claw
35:59 Faust (Final Boss)
Thunder Force 5
37:37 Deep Purple
40:12 Iron Maiden
42:49 A3
45:39 Guardian Knight
49:38 Vasteel Original
52:20 Guardian Animus
55:35 Khaos Ascendant (Final Boss)
Thunder Force 6
59:45 Gargoyle Perfect
1:01:49 Flame Maiden
1:04:30 Cherub Purple
1:07:02 B3
1:09:35 Vasteel Nocht (Phase 1)
1:10:49 Vasteel Nocht (Phase 2)
1:12:31 Vasteel Nocht (Phase 3)
1:14:05 Orn Emperor (Final Boss Phase 1)
1:16:22 Orn Emperor (Final Boss Phase 2)