Adora is reunited with her Grandfather King Miro, who was previously seen on He-Man. Its also nice to see Adam/He-man again on the series!
The plot of the episode holds together as well and its nice to see the team working together to defeat the Horde. The Crystal Dome is a good plot device to use against the rebellion and thankfully Heman and Shera defeat the Horde once again.
But its the emotion of this episode - the reunion of Adora and Miro and the ending, where Adora has to say goodbye and mentions to Spirit her heart is soaring is tug at the heart stuff. Good Writing!