Returning after its tribute to late cast member Cory Monteith, Glee presents an episode asking its young performers to pledge their loyalties and reveal their self-images, and reveal whether they consider themselves more of a Katy Perry or a Lady Gaga. This is the modern equivalent, I suppose, of previous questions posed about whether one preferred Marilyn to Jackie, or Ginger to Mary Ann. But I’m not sure it’s progress… just as I’m not sure, the past two years, whether Glee has lived up to its early creative spark. Tonight, though, it features guest star Adam Lambert, the American Idol flashy standout, introduced as a new character called Starchild, who’s auditioning for a spot in Kurt’s band.