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All of Glee's McKinley High graduates are coming back for Season 4, but will they appear in every episode?

"I want them to come back," co-creator Ryan Murphy told reporters after a TV academy event for The Glee Project, when asked about Mike and Mercedes, who are moving out of Lima but not following Rachel Berry's footsteps to New York. "I think it'll be a different way. I mean, no one is really going to be doing 22 episodes except Lea [Michele]. We haven't figured it out, but I know what the stories are. I just don't know how many episodes."

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Three more Glee cast member join The Glee Project as mentors