Question: What season was the mother promoted to a main character on how i met your mother and how many episodes did that season have?
Sentence (from "The Mother (How I Met Your Mother)"): Tracy McConnell appears in 8 episodes from "Lucky Penny" to "The Time Travelers" as an unseen character; she was first seen fully in "Something New" and was promoted to a main character in season 9.
Relevant evidence: Yes