* Meg is a character in the novel and film "A Wrinkle in Time" by Madeleine L'Engle. She is a young girl who embarks on a journey through time and space to rescue her father.
* IT is a fictional entity that is not mentioned in "A Wrinkle in Time." It is likely you are referring to a different fictional work.
Could you please clarify what you mean by "IT"? For example, are you thinking of a specific character or story?