Agatha initially agrees to manipulate Billy into doing just that, but changes her mind at the last minute. She kisses Rio/Death and embraces her fate, sacrificing herself so Billy can live. From the start, she had a soft spot for the teenager, accompanied by references to her long-dead son. The backstory is quite moving and the key to Agatha's unexpected change of heart. Her son's fate was revealed in the finale. Death came for him when Agatha was in labor, but agreed to give her 'time'. How much time? Six or seven years, during which mother and son bonded and wandered from village to village, Agatha occasionally killing more covens to absorb their power. But Death didn't forget, and with Nicky (Abel Lysenko) gone, Agatha gave in to all her worst impulses.
Which brings us to the Big Twist: Agatha and her son made up the ballad of the Witches' Way, sang it in local taverns and slowly built up the legend. The Witches' Way never existed. Agatha used the legend throughout the ages to trap witches and steal their powers. That was her intention at the beginning of the series, except this time: a portal opened. It seems that Billy has inherited Wanda's ability to twist and shape reality, even unconsciously. He wanted the road to be real, and it was.
The reveal is expertly done and ties everything up in a nice, satisfying bow, with one exception. The writers just couldn't let Agatha go completely; she returns as a ghost and joins Billy in his search for his brother Tommy. That's a creative choice that opens the door for a second season, and I strongly suspect we'll get one. But Ghost Agatha will be a tough plot point to crack. And it rather undermines the crucial moment of Agatha's sacrifice: actually doing something that does not directly benefit her. Overall though Agatha all the time is wonderfully entertaining, binge-worthy fun with just enough emotional resonance and heartbreak to add some depth.
All episodes of Agatha all the time are now streaming on Disney+.
