Colin is a red and yellow dragon that inhabits the binscape. To the Bin Weevils, he is huge, because of their size differences - weevils are quite small in comparison to dragons. He loves feeding on dirt doughnuts, a common food in Bin Weevils.
Living with Gam in the castle and being his companion, he makes an appearance outside the castle. You have work with several players and jump on buttons to fill a container with Mulch, which he heats up with his fire breath and afterwards Mulch is falling to the ground, which you have to click on quickly to obtain it. You can also see him in SWS Mission 2 'Trouble at Castle Gam', of which you have to brush his teeth.