Hanna-Barbera taking the infamous racist yellowface "Charlie Chan" character from the 1930s, making him an actual Asian (with an actual Asian, Keye Luke, doing the voice), and plopping him into a then-modern day (1972) Scooby-Doo mystery solving format with a gang of Chan kids.

Oh, did I mention they're also in a rock band?

Incidentally, the kids' voices were originally cast with young Asian actors as well, but the network complained that their dialogue "couldn't be understood", so they were replaced early in the series run with mostly white kids.

https://www.youtube.com/watch?v=DSLB2K3FPRw