Star Wars has revealed Anakin Skywalker actually led an army of slaves when he attacked the Jedi Temple in Star Wars: Episode III - Revenge of the Sith. Anakin Skywalker was Palpatine's prize, the Chosen One destined to destroy the Sith who he intended to corrupt. The prequel story is the tale of Palpatine's triumph, as he successfully seduced Anakin to the dark side.
In the end, it was Anakin's possessive love for Padmé Amidala that proved to be his downfall. The Jedi Master was deceived into believing Palpatine knew secrets of the Force that could potentially save Padmé from death - a complete lie, for Palpatine only knew Force techniques by which a Sith Lord could survive death for themselves - and he could not allow Darth Sidious to be executed. And so he intervened in Mace Windu's battle against Palpatine, striking the Jedi Master down, and swore his loyalty to the Sith. Palpatine put Anakin to a fearsome test to see if he was for real, initiating Order 66 to slaughter the Jedi and sending Anakin to the Temple at the head of an army of clone troopers. Anakin's mission was to kill the Jedi as he had killed Tusken Raiders at the beginning of the Clone Wars; men, women, and children, no Jedi was to be spared death. It's one of the darkest, most horrific moments in the entire Star Wars saga - but animated tie-ins have made it even bleaker.
Star Wars: The Clone Wars and Star Wars: The Bad Batch have revealed the true nature of Order 66. Every clone trooper was implanted with an inhibitor chip that activated when Order 66 was issued, overriding their own decision-making processes and leaving them no choice but to obey orders and kill the Jedi. Even more horrifically, Star Wars: The Bad Batch episode 7 went one step further and suggested the clones' true consciousness was actually suppressed, aware of everything going on but unable to prevent their bodies acting in accordance with Order 66. The clone troopers had no choice but to obey Order 66, for they were essentially slaves to their programming.
The slaughter at the Jedi Temple - particularly Anakin's killing the Younglings - was the moment he committed to the dark side of the Force. But the animated shows have revealed this evil act was even more shocking, because the former slave boy who had dreamed of freedom on Tatooine was literally leading an army of slaves against his Jedi family. It's unclear whether Anakin himself realized this was the case - either now or later - but certainly the irony would not have been lost on Palpatine.
The prequel trilogy was much-maligned when it was first released, but Disney and Lucasfilm have redeemed it. They've done this primarily by adding more detail, exploring what it means to be the Chosen One and fleshing out the characters, focusing on some of the most popular and memorable ideas and moments. In this case, Lucasfilm's retcons have made Anakin's fall even darker - adding new depth to one of the darkest moments in Star Wars lore.
