El Regreso is a flawed but watchable sequel. If you were a superfan of the 2010 series, you will cry during Episode 5. If you are new, start with the original. Telegram channels are great for finding the episodes quickly, but watch it on a proper screen—the bootleg quality ruins the atmosphere.
The revival is structured as a continuing series of mini-series or seasons on the Atresplayer platform: telegram los protegidos el regreso