The fictional high school of Las Encinas continues to be a playground for murderous mischief as the Spanish teen drama Elite made its return to Netflix on Oct. 20. Now in its seventh season, the series has added new characters to the salacious mix — Brazilian singer Anitta being among them — and brought back a member of the original ensemble cast, Omar Ayuso, who starred as Omar Shanaa from seasons one through five.

“One day by chance, we were on a train, and I asked him if he would be willing to come back,” says screenwriter, director and producer Carlos Montero, who created the series with Darío Madrona. “We gave him a protagonist role and we felt in debt to Omar because he always pulled out all the stops with our show. We love his character very much and we wanted to give him the importance we think he deserved.”

Elite has...