Everyone knows trolls live under bridges, and when the MayorÕs grand opening for the cityÕs newest bridge is cut short because of a huge, fearsome troll who claims the bridge as his new home, itÕs up to Scooby and Mystery Inc. to save the day. TheyÕll have to unravel the mystery, evict the hulking squatter and get the bridge up and runningÑhopefully before rush hour!