Although there are some studies that focus on specific aspects of Metatheater in the Spanish Golden Age (mostly centered in specific comic plays), no scholar has undertaken a comprehensive examination of this topic, especially with respect to serious dramas. This collaborative volume will collect works from 14 of the most reputable international experts in the field of Hispanic Golden Age drama studies. Their studies will examine the different modalities and levels of metatheatrical action and experimentation (theater inside the theater, or the presence of theater as a creative endeavor inside the plays). In the most simple and common dimension, characters pretend to be other people, or they feign traits that do not correspond to their own characteristics. Such actions generate interpretation issues related to linguistically appropriate and even kinetic behaviors. When characters adopt more complex metatheatrical behaviors they can become critics of other plays or even censure the attitudes of the audience that attended the performances (as in the case of Guillén de Castro). In the case of more complex metatheatrical dimensions, the text becomes an allegorical representation of the literary topic of Theatrum mundi such as in the case of the religious play by Calderón de la Barca El gran teatro del Mundo. Our kaleidoscopic volume will approach Metatheater in the Spanish Golden Age from a multiplicity of perspectives that, once combined, will allow us to understand the multifaceted and complex nature of this phenomenon.