Hi-Fi appears in 35 issues in this volume.
Waiting For the End of the World
Apocalypse Right Now!
Fur and Fangs!
The Secret History of Velma Dinkley
The (Not-So) Great Escape!
The Doctor Will Kill You Now!
Before the Storm
Velma, Warrior Queen of Monsterworld
Brotherly Hate!; Scrappy-Doo and Cliffy in Monster Meat!
Dog Eat Dog!; Left Behind
The Sacrifice!; Secret Squirrel!
Tree Time!; Secret Squirrel! Strange Bedfellows!
Haven!; Secret Squirrel in To Bea or Not To Bea!
Child's Play!; Secret Squirrel! in Broken!
A Scooby-Doo Christmas; Deadly Reunion!
Uncivil War!; Secret Squirrel! in Tollbooth Terror
A Dog and His Boy!; Secret Squirrel in... No Noose Is Good Noose!
Disaster!; Secret Squirrel in Brained!
Afterlives; Secret Squirrel in Animal Magnetism!
Bloody Reunion!; The Secret Origin of Secret Squirrel!
The Unexpected!; Secret Squirrel in The Big Bang!
Night of the Living Fred!; A League of His Own!
The Awakening!; Atom Ant in Bugs, Bracelets and Behemoths!
Family Reunion!; Atom Ant in G'Nortwest Passage!
The Brothers Dinkley!; Atom Ant in When Atoms Collide
The Thing Who Would Be King!; Atom Ant in Supermant!
The End Is Near!; Atom Ant in In the Belfry
The End is Here!; Atom Ant in Awards Season
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