Sigma-Alpha 2[1] is a group mentioned in Sonic Adventure 2 and Sonic Adventure 2: Battle. It is a team of GUN troopers who were responsible for the capture of Sonic the Hedgehog during the Space Colony ARK incident.


Sonic Adventure 2

In Sonic Adventure 2, Sigma-Alpha 2 was deployed by GUN to apprehend Sonic when he had been framed for the theft of a Chaos Emerald as well as deserting Prison Island. Upon locating him, the team introduced themselves to Sonic before handcuffing him and taking onboard their helicopter.[2] While flying above the capital city however, Sonic managed to take out Sigma-Alpha 2 and escape to the city below.

In other media

Archie Comics

The Paladin Team Sigma-Alpha 2.

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, Sigma-Alpha 2's full name was Paladin Team Sigma-Alpha 2. Like in the games, this group was responsible for capturing Sonic the Hedgehog when he was framed for a theft of a Chaos Emerald. After clearing up the misunderstanding, the group became allies of the Knothole Freedom Fighters, though they would later be legionized and brainwashed into serving the Eggman Empire.


  • It should be noted that Sigma-Alpha 2 can be shortened to "SA2", which was possibly a self-reference within Sonic Adventure 2 as the game's abbreviation is also "SA2".


  1. Sonic Team (June 23, 2001) Sonic Adventure 2. Dreamcast. Sega. Area/Level: Opening sequence (Hero story). "Helicopter pilot: Sigma-Alpha 2 heading due south over the city."
  2. Sonic Team (June 23, 2001) Sonic Adventure 2. Dreamcast. Sega. "Sonic the Hedgehog: I'm Sonic! Sonic the Hedgehog! Some military troops suddenly showed up saying they were looking for me. Looks like they might be taking me for a ride somewhere! Hey! What's this? Handcuffs? Wait a minute! What are you talking about? I'm not a deserter from any military facility!"

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