Bark the Polar Bear

Bark the Polar Bear is Bean the Dynamite's partner. And while his partner is a crazy chatterbox, Bark is calm and COMPLETELY silent. And thanks to his strength, he is a formidable foe for Sonic the Hedgehog and the other Freedom Fighters.

Past
Bark's past is almost completely unknown. The only thing we know is that he was once a member of Nic the Weasel's gang, which also included Bean the Dynamite and Fiona Fox. Bark may no longer be part of the group, but he's still partners with Bean. (StH: #160)

First Battle With Freedom Fighters
Bark and Bean's first encounter with Sonic the Hedgehog was when Dr. Eggman hired them to attack Sonic on his birthday. The two criminals had apparently met up with Evil Sonic sometime earlier and the meeting was apparently...not so good for Bark and Bean. So the two, thinking Sonic was the one who insulted them, accepted the job and attacked the recently rebuilt Freedom HQ. But Bark was defeated when the Freedom Fighters completely surrounded him and Fiona advised him to surrender, which he did. But when Octobot attacked Freedom HQ, Bark and Bean used this as their chance to escape, although Fiona tried to stop them. (StH: #160, #161)

Later Encounters
Bark and Bean were later hired by Dr. Eggman once more to find out if the rumours of Rouge having the Master Emerald were true. (and in the end, they weren't) Nack the Weasel was also hired to investigate the rumours, although he didn't actually work with the duo. Bark and Bean, now sporting Extreme Gear thanks to Bean being a former member of the Battlebird Armada, ran into Sonic and Antoine. Bark was defeated when Ant sliced his Extreme Gear in half and caused him to crash. Bark was sent to Knothole Prison along with Bean, Nack, Mammoth Mogul, and Ixis Naugus. (StH: #173)

Not long after, Eggman's Egg Fleet attacked Knothole Village and even captured Bark and his fellow prisoners. But Sonic, Knuckles, Tails, and Amy Rose rescued all of Eggman's prisoners, including Bark and the other criminals. But when everyone was sent to New Mobotropolis, Bark, Bean, and Nack took advantage of the opprotunity and joined Mammoth Mogul. Fortunately, NICOLE teleported all of the criminals to the new city's prison, where Bark still currently is, being as silent as ever. Bark also has since watched Sonic'a fight with Tails. (StH: #178, #179)