The Red Eagle

It was accused of plagiarism by Corita Viamonte, who wrote a 1963 novel called 'Red Eagle' (aka 'The Masked Swordsman') with the same beginning, general plot and title.

The role of Loles León was written for her.

Season 6 originally consisted of 21 episodes, but the network single handedly decided to split it into two shorter seasons (13 and 8 episodes each one) and aired them four months apart, regardless of how this affected to the storylines.