In Part 1 of the two-part season finale, Nick trains for battle under Leanbow's tutelage, while the Master chooses Itassis to go to the surface world and fight the Rangers. Later, the Master realizes he'll have to take matters into his own hands.
Bickering between Nick and Vida puts them, and possibly the other Rangers, at risk from the Ten Terrors. Also: Serpentina decides to break the Rules of Darkness; Leelee learns her destiny; and Koragg makes an appearance.
The Ten Terrors of the Underworld set out to find the mysterious wizard known as “The Light,” whose identity is revealed by Phineas. Meanwhile, a fiery creature named Magma challenges the Rangers to play a game; Udonna searches for Leanbow.
The Rangers face a villain who is attempting to steal life forces from the citizens of Briarwood; Chip falls victim to a magic spell and, in order to be healed, must travel with Daggeron to Mount Isis, where they encounter Koragg.
Quicksand and giant spiders in the nightmarish Cimmerian Forest are among the obstacles the Rangers---under the leadership of Xander---face as they try to obtain the powerful Fire Heart before Necrolai can get her evil hands on it.