Instructions: In this task, you are given a question. You have to answer the question based on your information.
Input: "Imperial" was the second story arc from Grant Morrison's run on the Marvel Comics title New X-Men, running from issues #118-126, it further explored the origin behind the character Cassandra Nova as well as giving more depth to the student body at the Xavier Institute, specifically the Stepford Cuckoos, a set of fictional mutant psychically linked what?
Output:
quintuplets