You may be looking for Argus from Sonic Underground.

Argus (アーガス, Āgasu^?) is the supposed entity believed to have been responsible for the Argus Event, in which the Nocturnus Tribe of Echidnas were transported en masse into the Twilight Cage. During this event, all of the echidnas reported hearing a voice in their heads that said something like "Argus".

Trivia Edit

• After Nestor translates the Precursor Tablets you give him, Nestor will refer to the Twilight Cage as "Argus' Cage".
• The last of the tablets that Nestor translates just says "The will of Argus, must escape Argus".
• In Greek mythology, Argus is the name of a hundred-eyed Giant in service to the Goddess Hera. One of Argus's greatest services to the Olympians was slaying the Mother of All Monsters, Echidna, while she slept.
• Nothing is known about Argus' form except it appears to have tentacles.

Sonic Chronicles: The Dark Brotherhood
Playable characters	Sonic | Tails | Amy | Knuckles | Rouge | Big and Froggy | Cream and Cheese | Eggman | Shadow | Omega | Shade | Super Sonic
Other characters	G.U.N. | Commander | Nocturnus Clan | Ix | Nestor | Super Ix | Gizoids | Emerl | Scylla | Charyb | Knuckles Clan | Egg Bot | Swatbot | Krag | Syrax | Raxos | Haniman | Queen N'rrgal | Thebes | Thelxe | Overmind | Twilight Cage Pirates | Precursors | Chao | Argus | Vector
Places	Green Hill Zone | Central City | Blue Ridge Zone | Mystic Ruins | Angel Island | Metropolis | Metropolis Ground Zero | Kron Colony | Twilight Cage | Zoah Colony | N'rrgal Colony | Voxai Colony Alpha | Voxai Colony Beta | Nocturne
Other	Dexter | Argus event | Sequel | Archie Prequel