The Best Episodes Written By Glenn Leopold

Dr. Viper floods Megakat City with Katalyst X-63, an experimental formula that mutates any living thing it touches into grotesque, menacing versions of themselves.

A baby dinosaur is brought into the present time and the Smurfs try to get him back by a magic key.

While visiting Scooby's parents in Dooville, Flim-Flam becomes hypnotized by a circus ringmaster.

Rosey runs away from home when she thinks the Jetsons are going to replace her.

The Jetsons contend with a transmuting alien called the Mirrormorph, who can become an exact duplicate of that person, but remains mute.

Grandpa Montague Jetson returns and falls in love with a young teenager named Nova Neutron, unknown to him that her boyfriend Tyco has mistaken him for Mr. Spacely and plans to rob him blind.

The Frightful Four have arrived to destroy the Fantastic Four. They take control of Ben's mind to turn him against the team. Can the Fantastic Four overcome this threat? And who exactly is Medusa?

The Inhumans teleport back to the Great Refuge, but Johnny is teleported there too after jumping in after Crystal. The rest of the team try to find him, while it is learned Black Bolt's evil brother, Maximus, has taken over.

Bruce Banner is in town, which means the Incredible Hulk is too. When the Hulk goes on a rampage, Ben gets in his way.