Scooby-Doo! Mystery Incorporated (2010)

S1E23 A Haunting in Crystal Cove

When a mysterious shadowy figure targets Fred's dad, it falls to Scooby and the rest of the gang to unravel the enigma. Can they solve the case in time, or will Fred be forced to abandon his passion for mystery-solving? Additionally, what significance does the puzzle piece that Fred's dad holds have in this unfolding mystery?