Who is Scooby-Doo's cartoon nephew?

Scrappy-Doo is Scooby-Doo's cartoon nephew. He is a small Great Dane puppy known for his aggressive enthusiasm, his catchphrase "Puppy power!", and his eagerness to confront monsters rather than run away from them.

The character was created by Hanna-Barbera and introduced in 1979 in the animated series "Scooby-Doo and Scrappy-Doo." He was added when the original franchise was facing declining ratings, and his energetic personality helped give the show a new direction. Several later series placed Scooby, Shaggy, and Scrappy at the center of shorter, more comedic adventures.

Scrappy is sometimes confused with Scooby-Dum or other members of Scooby's fictional family, but those characters are different relatives. Scrappy's prominence declined in later versions of the franchise, and the 2002 live-action film notably portrayed him as an antagonist, a sharp contrast to his original role as Scooby's excitable nephew.