The Riddler is looking for the answer to the ultimate riddle, the true identity of Batman, so he hatches a plan to capture Batgirl and Robin in order to force Batman into the open to rescue them--and Batman will need some help to preserve his secret.

When the Mystery Inc. gang gets lost in the desert they decide to check out the local ghost town, Sladeville, and find it apparently full of ghosts--but Velma suspects that living people are behind the ghostly manifestations.

When a wicked werecat plagues a big cat park on the outskirts of Gotham City, Mystery Inc. joins forces with Batman to crack the case, but little do they know, more than one crafty kitten is at play in the preserve.

The Liberty Dog Show is being haunted by two monster mutts with glowing red eyes, and the Mystery Inc. gang are called in to investigate--but the gang suspects that these ghost dogs are too well trained to be real ghosts.

When the whale-watching cruise they are on sails into an area which is supposedly cursed, and is immediately attacked by a group of apparently aquatic monsters, the Mystery Inc. crew set out to find the villain behind the attack, with some timely help from Batman and Robin.

When an ancient Greek crypt at the Gotham City Museum of Natural History is opened unleashing mythological monsters, the Mystery Inc. gang team up with Batman and Batwoman to battle the creatures and uncover the super-criminal behind the mayhem.

Harley Quinn and Poison Ivy escape from Arkham Asylum and head back to Ivy's hideout; however, Harley proves to be a demanding roommate, so Ivy helps her take over a carnival and even grows her plant versions of Batman and Robin to boss around--but when Poison Ivy feels she has done enough and withdraws from the field, Harley discovers that being a criminal boss is a lot more difficult than she imagined.

Wishbone ends up missing while trying to locate other missing dogs, and Joe must solve the case alone.

When Weather Wizard unleashes the fury of his giant weather wand to extort money from the citizens of Central City, The Flash must outrun lightning to stop him.

When he uncovers a mysterious metal object while digging in the front yard, Wishbone imagines himself as Professor Otto Lidenbrock who attempts to discover the center of the earth by leading an expedition into the crater of an Icelandic volcano.