Question: Who is a fictional character in Nickelodeon's animated television series "" and "The Legend of Korra", greatly aided the previous avatar, Aang, in his efforts to save the Earth Kingdom from destruction?
Sentence (from "Lin Beifong"): Lin’s mother, Toph Beifong, greatly aided the previous avatar, Aang, in his efforts to save the Earth Kingdom from destruction.
Relevant evidence: Yes