Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: Who was the hero of Littlefoot and Cera's new legend? Movie plot title: The Land Before Time VI: The Secret of Saurus Rock Movie plot: Littlefoot's grandfather one night tells the children a story about "The Lone Dinosaur" (a pun on The Lone Ranger), a legendary longneck who once protected the Great Valley from the most ferocious sharptooth ever to live. A fight ensued, which led to the Sharptooth's death. However, the sharptooth left "The Lone Dinosaur" with a scar slashed across his right eye. Soon after the battle, a huge monolith that resembled a proud sauropod, having life-sized Sharptooth teeth arranged around his neck, came out of the ground during an earthshake. The dinosaurs called it "Saurus Rock". The legend also states that if anyone damages the monolith, bad luck would descend upon the valley. The next day when the kids are playing, Littlefoot accidentally falls off a cliff. Just before he hits the ground, a gruff Whiptail rescues him. This longneck introduces himself only as "Doc" and gives no knowledge of his history. Littlefoot is intrigued by this newcomer, who is scarred across one eye and displays prior knowledge of the Great Valley's topography. For the preceding reasons, Littlefoot assumes that Doc is the Lone Dinosaur. He tells his friends this, narrating an apparently extemporaneous legend to support his assumption. Inspired, Cera's infant nieces, the twins Dinah and Dana, go to Saurus Rock without anyone noticing. The next day, A worried Cera informs Littlefoot that Dinah and Dana are missing. While searching for them, they Recall their talk of the day before, they go to Saurus Rock to find them. When they finally reach Saurus Rock, they see Dinah and Dana on the top. As they climb up to rescue them, Dinah and Dana fall off the top and land on Cera, causing the life-sized stone tooth on which she is standing to break off. As they walk home, an odd-looking Sharptooth (referred to as Brown Sharptooth) chases them. As they are being pursued, they cross a gorge via a suspended log, and as the Sharptooth follows them, he throws the log over the ravine. They start to get out, with no sign of the Sharptooth yet, until Spike...
A:
Grandpa Longneck