The Mark of Scooby
S1:E15
1983
IMDb
The gang goes to the Old California Festival, where they see a play involving Scoobys favorite hero El Sabueso, who helps the poor. Later that night, while camping out, Scooby dreams he is El Scoobo and Scrappy is Scrappito, and they must save Senorita Daphne and Senor Shaggy from the commandante.