Sinbad is an alternate reality version of Knuckles the Echidna encountered by Sonic during Sonic and the Secret Rings. He looks identical to Knuckles aside from his clothing: a white Arabian i'gal headdress, a dishdasha robe with a purple belt, and gray metal wristlets.
Within the Secret Rings world, Sinbad is a famous sailor and adventurer. Shahra recommended that Sonic seek him out in order to acquire his Water Blue Ring (the World Ring of Pleasure), which can control storms. The hedgehog finds Sinbad being held captive aboard the sky-mantas of Levitated Ruin, and frees him from his cage by solving a mirror puzzle. Much like Knuckles, though, Sinbad is quick to anger and almost ends up fighting his rescuer.
|Sonic the Hedgehog (game series) characters|
|Heroes||Sonic (Super, Hyper, Darkspine, the Werehog, Excalibur) | Tails (Super) | Knuckles (Super, Hyper) | Amy Rose | Cream | Blaze (Burning) | G.U.N. Commander | Emerl | Silver (Super) | Marine | Shade | Lumina Flowlight | Chip | Shahra | Knights of the Round Table | Caliburn | Yacker | Sticks|
|Anti-heroes/ Neutrals||Shadow (Super) | Rouge | Espio | Charmy | Vector | Mighty | Ray | E-102 Gamma | Chaos (Perfect) | E-123 Omega | Bean | Bark | Jet | Wave |Storm | Merlina | Illumina|
|Villains||Dr. Eggman | Metal Sonic | Mecha Sonic (Super) | Metal Knuckles | Tails Doll | E-Series | Fang | Gemerl | Eggman Nega | Battle Kukku Army | Biolizard | Black Doom | Ix (Super) | Void | Iblis | Mephiles | Solaris | Dark Gaia | Witchcart | Erazor | King Arthur | Orbot | Cubot | Lyric|
|Teams||Sonic/Heroes | Rose | Dark | Chaotix | Babylon|
|Other||Gerald & Maria Robotnik | Big | Chao | Tikal | E-101 Beta | Heavy and Bomb | Flicky | Animals|