Every performer the series billed as starring across its six seasons, from 2009 to 2015, first on NBC and then on Yahoo Screen. That is the whole rule, and it takes in the seven students who founded the study group plus the dean of the college and their first Spanish teacher, nine in all. Three more actors joined that table for the fifth and sixth seasons without ever joining that billing, so they are not answers here, however well you remember them, and neither is the large recurring and guest company. A feature film had been announced but not released when this set was built, so nothing from it is included. The answer is always the actor, never the character. A surname on its own counts. Cast order follows the series billing, corroborated against Wikidata. Nothing in this set gives away the story: no question, clue, option or answer reveals how anyone's story ends.