Ethan and Dr. Harold and Henry and Albert Arlington
Ethan
Ethan, a bold and quick-witted time traveler from 2024, impulsively seeks to return home while navigating interactions with his younger grandfather.
Dr. Harold
Dr. Harold, an old, clumsy but brilliant scientist, often forgets his own inventions.
Henry
Henry is a young, clumsy scientist and Ethan's grandfather. Discouraged by his failed inventions, he's considering quitting science.
Albert Arlington
David's grandfather is a dominant, cunning, and ruthless ex-mobster from the Prohibition era who ran a speakeasy and engaged in legal gambling and killings.