Big Bad is a big town baddy and has appeared in Chasing Balloons, Brum and the Pantomime Cow, Brum and the Snow Thieves and Brum and the Splash and Grab.
Big Bad first appeared in Chasing Balloons when he steals the balloons from the seller while she is distracted by Granny Slippers. He steals them presumably for his own greedy wants to sell them for money. He tries to shake Brum several times by getting a taxi but the balloons won't fit and by hiding in a phone booth. Eventually he stuffs up and falls into a construction pit and emerges covered in mud and muck and watches helplessly as Brum takes the balloons away.
Two weeks later he appears with a partner in crime in Brum and the Pantomime Cow and steals the buskers money. They try to loose Brum in the theatre and dress as a cow but Brum chases them on stage and their disguise falls apart. Brum grabs the money back asthe performers go after them. However Big Bad gets awayoffscreen
In Brum and the Snow Thieves he appears with a girlfriend planning to rob the Ski Resort of their money. He ducts under the counter and drags his girlfriend under too. At the last moment they snatch the money and stuff it into her bag and run away pushing past people and keep running until Big Bad pushes some skies onto Brum retraining him briefly. Both keep running until she sees some manikins with ski jackets on them. Both agree and get into disguise but Brum sniffs them out when Big Bad sneezes. They run out onto the snow and go up the slope clumsily, knocking down a snowman in the process and reach the top thinking they have won. But Brum catches them and they steal a pair of skies each and go down but due to their inexperience at skiing they crash and Brum buries them under snow forcing them to give up the money. The guests at the resort throw snowballs at them as punishment.
Big Bad later reappears in Brum and the Splash and Grab with a new girlfriend who is pretty and athletic. They see the big town silver swimming trophy and the medals and both agree to steal it as it's worth thousands of millions. They try to get it off the guards but they pushed around in the crowd and left behind. Big Bad's new girlfriend gets hit in the head and dazzled. Frustrated Big Bad rudely drags her into the building. The duo approach the cup behind the cheering squads and blend into the crowd by cheering until they see a lifeguard appear from the change rooms dressed in swimming overalls. The two run to the change rooms and ditch their clothes together and emerge prentending to be swimmers. Big Bad gets the medals while his girlfriend gets the trophy holding it as if she were holding her own child and they start making their way to the change rooms. Brum sees them and cuts them off. The girlfriend hesiitates not comfortable making a getaway in a swimming jacket but Big aBad grabs her and they jump into the pool and swim away. They push past the mayoress and run to the big town lake as Brum and the two swimming coaches run after her. They steal a speedboat but Brum latches onto the water skies tied on and goes after the naughty pair. The girlfriend sees first and panics as Big Bad recklessly drives trying to get rid of Brum. Eventually Brum gets on land and a tug of war battle ensues with Big Bad's girlfriend urging the boat on but Brum pulls them ashore. The girlfriend looks up and sees Brum, the swimming coaches and the Policewiman looking at them. Big Bad surrenders and has his girlfriend, properly embarrassed hand back the loot. They are presumably arrested on the spot as they are never seen again.
- Big Bad's first partner in crime possibly appeared in Brum and the Bushes as one of the thieves
- Big Bad's girlfriend in Brum and the Snow Thieves later appeared in Brum and the Shop Window Dummy looking dirty and dishevelled implying that he broke up with her in favor of the girlfriend in the Splash and Grab. That would awkward for the three of them in jail.
- Big Bad has stolen balloons, two lots of money, The Big Town silver swimming trophy and all of the medals, disguising himself in a cow suit, a ski jacket, a pair of skis and a swimming suit. He also stole a speedboat to get away in Brum and the Splash and Grab.