Chinese Dan agrees to give Cardi his retired racing greyhound. Cardi is delighted with his newfound friend and promptly christens him Martin, while the gang see a cash opportunity and hatch a plan to get the dog racing again. But training is interrupted when Martin runs off into the woods and returns with a human foot. Vin goes to Gary the undertaker for some help. Meanwhile, Martin starts to have some success at the races when the gang realise he'll run faster when it's Cardi's scent involved.