Kai’s investigation of a Vermillion helmet leads to the discovery that Krux is alive and living under an assumed identity in Ninjago.
Kai’s vision of his parents isn't a true flashback, but rather his mind’s interpretation of the scene, which explains why baby Nya is wearing her modern Water Ninja attire.
Here are the key "helpful" features, secrets, and plot points to look for in this episode: [S7E3] A Time of Traitors
The golden sarcophagus that traps Cyrus Borg is the same one the Serpentine tried to steal in Season 1, Episode 10 ("Child's Play").
Nya confront the new, mysterious Samurai X in the museum. Kai’s investigation of a Vermillion helmet leads to
Lloyd struggles with his role as a leader in training while Master Wu is incapacitated due to the Time Punch.
" A Time of Traitors " (Season 7, Episode 3 of Ninjago: Masters of Spinjitzu ) is a pivotal episode focused on the and the expansion of the Vermillion threat. Nya confront the new, mysterious Samurai X in the museum
Krux (disguised as Dr. Saunders) tells Kai that his parents were traitors who aided the Hands of Time in forging the Vermillion armor.