Victor Frankenstein is a clever and industrious 10-year-old boy who is inspired by science. He lives with his parents and dog, Sparky, in the town of New Holland. Victor immerses himself in making films and inventing in his attic workshop. When he loses Sparky, Victor use scientific ingenuity to bring him back to life.

Sparky is a devoted and playful bull terrier whose sense of curiosity is matched only by his beloved owner, Victor. Sparky enjoys chasing after balls and being the star of Victor's homemade movies. He exudes tons of energy and enthusiasm.

Nassor is highly intelligent, serious and intense. He takes a darker, more doomsday view on life than the other kids in New Holland. Nassor is instantly skeptical of the rumors surrounding Victor's experiments with electricity, but once convinced, he is zealous in his quest to obtain Victor's secrets.

Weird Girl doesn't fit in well with the other kids in New Holland, but it's easy to see why-she delivers ominous pronouncements in a monotone voice with an unnerving stare. Her constant companion is her fluffy, white cat Mr. Whiskers, whose unblinking gaze matches her own. The other kids gave them a wide berth-especially when Weird Girl rambles about Mr. Whiskers' dreams.

Toshiaki is over-achieving and mega-competitive. He delights in beating Victor at his own game and like a power-hungry, mad scientist, Toshiaki will stop at nothing to win the top prize in the school's science fair-even if it means stealing Victor's ideas to do it.

Bob is a momma's boy who is the brawn to Toshiaki's brains. He is agreeable and never mean-spirited, but on the flip side he's easily led and gullible. Bob follows Toshiaki everywhere, but is the first one to run to Victor for help when he gets in over his head.

Edgar "E" Gore is a needy misfit who doesn't have friends but is desperate to be Victor's partner for the science fair. In his attempt to be accepted, "E" tends to mess things up and often fails to think before he speaks. Even though "E" promises not to tell Victor's secret, he accidentally spills the beans.

Elsa Van Hesling is a soulful and somber classmate of Victor. She lives next door to him with her tyrant uncle, Mayor Burgemeister, who forces her to be this year's "Little Dutch Girl" at the town's celebration of Dutch Day. Elsa also has a beloved pet, her poodle Persephone, and truly empathizes for Victor when he loses Sparky.