Seth is one of the 25 playable characters in Street Fighter IV, the action game developed by Capcom for multiple platforms.

Seth currently serves as the CEO of S.I.N., the weapons manufacturing division of Shadaloo. He was developed in order to provide M. Bison, leader of Shadaloo, with a new body. He has been modified using advanced technology and a rotating sphere in his abdomen is believed to be the source of his power. Using the device, he can gather information on all of the world's top fighters and incorporate their special moves into his own fighting style.Official Site: Street Fighter IV Seth Street Fighter Wiki: Seth

Seth appears as a non-playable boss character in the arcade version of SFIV, but will be playable in the home console versions of the game.IGN: Sakura and Seth Join Street Fighter IV (October 8, 2008)

Street Fighter 4 is the first game in the main series to be released for arcades in ten years. The console ports of the game feature additional gameplay modes, such as online play and Challenge mode's Time Attack. The game has a similar feel to Super Street Fighter II Turbo, and also takes gameplay elements from Street Fighter III 3rd Strike.1up.com: Street Fighter 4 (Arcade) Preview (February 21, 2008)

1. Sonic Boom: ↓ down-right → + punch

2. Shoryuken: → ↓ down-right + punch

3. Hyakuretsukyaku: ↓ down-left ← + kick

4. Tandem Engine: ↓ down-left ← + punch

5. Yoga Teleport: → ↓ down-right or ← ↓ down-left + punch x 3 or kick x 3

6. Spinning Piledriver: ← down-left ↓ down-right → up-right ↑ + punch

1. EX-Sonic Boom: ↓ down-right → + punch x 2

2. EX-Shoryuken: → ↓ down-right + punch x 2

3. EX-Hyakuretsukyaku: ↓ down-left ← + kick x 2

4. EX-Tandem Engine: ↓ down-left ← + punch x 2

5. EX-Spinning Piledriver: ← down-left ↓ down-right → up-right ↑ + punch x 2

1. Tandem Storm: ↓ down-right → ↓ down-right → + punch
2. Tandem Stream: ↓ down-right → ↓ down-right → + punch x 3

• YouTube: Street Fighter IV - Seth's Ultra Combo (Time: 1:01)