Question: These heads of powerful talking Olmec rulers were featured in what Nickelodeon show which aired from 1993 to 1995?
Sentence (from "Olmec colossal heads"): Given that the extremely large slabs of stone used in their production were transported over large distances, requiring a great deal of human effort and resources, it is thought that the monuments represent portraits of powerful individual Olmec rulers.
Relevant evidence: Yes