Gekkor is one of the Ten Terrors.
A spear-wielding Wyvern/Gecko creature that wears a visor, Gekkor stopped Oculous from shooting Necrolai with his rifle, willing to lend her an ear. He was also with her on the surface, watching the battle between Magma and the Rangers. Gekkor seems to be the fastest of the Terrors, able to move at lightning speed in battle. Utilising his speed, he was able to overwhelm all the Power Rangers plus Solaris Knight together. He is also able to shoot a barrage of needle-like projectiles and summon forth fiery green energy blasts from his spear. He was the first to mention that the Master was going to return. When Oculous was chosen to be the next to attack by the Stone of Judgment, Gekkor was curious (and seemed somewhat annoyed) that he himself was not chosen to carry out the punishment and was reminded by Matoombo that the Stone of Judgment is never wrong. In The Snow Prince, when Megahorn was selected by the Stone of Judgment to attack the surface, the dragon-like terror boasted proudly about him being chosen and rubbed Gekkor's face in it, to which the wyvern replied: "Whatever!"
In Light Source, Sculpin took Gekkor and Matoombo with him to get the Master's spirit from Leanbow. Gekkor battled Leanbow, using his lightning speed to his advantage against the knight. However, Leanbow was able to severely injury Gekkor by striking him in the stomach with his sword then using a fire attack on him. Gekkor claimed that he still could fight but Sculpin stopped him and ordered Matoombo to fight. Gekkor was irritated and jealous that Matoombo got to fight Leanbow. When Sculpin extracted the Master's spirit from Leanbow's body, Sculpin gave Gekkor his spirit to take care of.
In The Return, Gekkor was the most zealous in punishing the traitorous Matoombo and so he was dispatched to deal with Matoombo, who managed to elude him with the help of Vida and Xander. Gekkor was desperate in his chase, following Vida and Matoombo on board the Solar Streak Megazord and into the Dawn Woods, demonstrating his great speed. However, when he finally caught up with Xander and Matoombo, it turned out that Vida transformed into Matoombo to distract the wyvern-like Terror. Gekkor fought the six main Rangers and nearly swiftly defeating them with a large sphere of green energy, his full power, at them, almost assuring a "Sweet" victory. However, Gekkor was finally killed by the restored Leanbow with a Blazing Storm Slash. This made him the sixth Terror to be destroyed and the fifth to be destroyed by the Rangers. He was also the first Terror to be destroyed by the Rangers before being chosen to do so by the Stone of Judgment.