(SPOILERS) Evolution of Final Bosses in 3D Sonic Games (1995 - 2022)

Game footage by: Retro Game Spacko (for Sonic Labyrinth), Shadowserg (for Sonic 3D Blast Genesis), SonicJGB (for Sonic 3D Blast Saturn, Sonic 2006, Sonic Unleashed HD, Sonic Generations and Sonic Forces), BossBattleChannel (for Sonic Adventure 1 & 2 and Sonic Heroes), ProsafiaGaming (for Shadow The Hedgehog, Sonic and the Secret Rings, Sonic Unleashed SD, Sonic and the Black Knight AND Sonic Boom: TRoL), XHolyPuffX (for Sonic Colors), Cyberman65 (for Sonic Lost World console ver.), HellfireMisc/NTom64 (for Sonic Lost World 3DS), Retro Master (for Sonic Colors Ultimate) and aWiibo (for Sonic Frontiers)

This video showcases every final boss from every 3D Sonic games.

Timestamps:

Sonic Labyrinth (SEGA Game Gear - 1995)
0:08 Smiley Bomb

Sonic 3D Blast (US)/Sonic 3D: Flickies’ Island (EU) (SEGA Genesis/SEGA Saturn - 1996)
2:22 Panic Puppet Zone Boss (SEGA Genesis version)
4:43 Final Weapon (SEGA Genesis version)
9:00 Panic Puppet Zone Boss (SEGA Saturn version)
11:10 Final Weapon (SEGA Saturn version)

Sonic Adventure (Dreamcast/Gamecube/PS3/Xbox 360/PC - 1998)
15:13 Chaos 6 (Big)
15:47 Chaos 6 (Knuckles)
17:16 E-101 Beta Mk.II (Gamma)
18:45 ZERO (Amy)
20:09 Egg Walker (Tails)
21:30 Egg Viper (Sonic)
24:38 Perfect Chaos

Sonic Adventure 2 (Dreamcast/Gamecube/PS3/Xbox 360/PC - 2001)
27:50 Shadow The Hedgehog (Hero)
29:27 Sonic The Hedgehog (Dark)
31:19 The Biolizard
35:05 The Finalhazard

Sonic Heroes (PS2/Gamecube/Xbox/PC - 2003)
37:40 Egg Emperor (Team Hero)
41:05 Egg Emperor (Team Rose)
44:12 Egg Emperor (Team Dark)
46:38 Egg Emperor (Team Chaotix)
50:27 Metal Madness
54:06 Metal Overlord

Shadow The Hedgehog (PS2/Gamecube/Xbox - 2005)
58:21 Sonic & Diablon (Pure-Dark Dark)
1:02:08 Black Doom (Pure-Dark Hero)
1:04:11 Egg Dealer (Semi-Dark Hero)
1:07:00 Sonic & Diablon (Semi-Dark Dark)
1:09:28 Egg Dealer (Neutral Hero)
1:12:28 Egg Dealer (Neutral Dark)
1:14:54 Black Doom (Semi-Hero Hero)
1:17:18 Egg Dealer (Semi-Hero Dark)
1:20:04 Sonic & Diablon (Pure-Hero Dark)
1:22:57 Black Doom (Pure-Hero Hero)
1:24:54 Devil Doom

Sonic The Hedgehog (Xbox 360/PS3 - 2006)
1:30:58 Egg Wyvern (Sonic)
1:37:04 Mephiles (Shadow)
1:39:45 Iblis (Silver)
1:43:35 Solaris

Sonic and The Secret Rings (Wii - 2007)
1:48:41 Erazor Djinn
1:51:30 Alf Laylawa-Layla

Sonic Unleashed (Wii/PS2/Xbox 360/PS3 - 2008)
1:55:51 Egg Dragoon (Wii/PS2 version)
1:59:53 Dark Gaia (Wii/PS2 version)
2:03:40 Perfect Dark Gaia (Wii/PS2 version)
2:06:47 Egg Dragoon (Xbox 360/PS3 version)
2:10:01 Dark Gaia (Xbox 360/PS3 version)
2:17:49 Perfect Dark Gaia (Xbox 360/PS3 version)

Sonic and The Black Knight (Wii - 2009)
2:21:48 King Arthur (Avalon)
2:23:14 The Dark Queen

Sonic Colors (Wii ver. - 2010)
2:25:13 Egg Nega Wisp Armor

Sonic Generations (PS3/Xbox 360/PC ver. - 2011)
2:28:28 Time Eater

Sonic Lost World (Wii U/Nintendo 3DS - 2013, PC - 2015)
2:32:44 Super Eggman Robo (Wii U/PC version)
2:34:38 Super Eggman Robo (Nintendo 3DS version)

Sonic Boom: The Rise of Lyric (Wii U - 2014)
2:38:48 Lyric

Sonic Forces (Nintendo Switch/PS4/Xbox ONE/PC - 2017)
2:46:59 Death Egg Robot

Sonic Colors Ultimate (Nintendo Switch/PS4/PS5/Xbox ONE/Xbox Series X|S/PC - 2021)
2:52:26 Egg Nega Wisp Armor

Sonic Frontiers (Nintendo Switch/PS4/PS5/Xbox ONE/Xbox Series X|S/PC - 2022)
2:55:52 Supreme
3:00:08 The End (Hard/Extreme Mode)