As returning star Cristin Milioti explains to PEOPLE, the long-awaited continuation of the "USS Callister" storyline — which saw digital clones of employees being trapped inside a VR-based massively multiplayer online game by their boss — went through many different iterations before settling on what debuted on Thursday,

This story discusses major plot developments in the "Black Mirror" episode "USS Callister: Into Infinity," currently streaming on Netflix. Since the "Black Mirror" episode "USS Callister" first streamed on Netflix in 2017,

“USS Callister: Into Infinity” may be the only sequel so far, but there are plenty of callbacks to other episodes this season, which boasts stories led by marquee talents like Issa Rae, Emma Corrin, Rashida Jones, Tracee Ellis Ross and Oscar nominee Paul Giamatti.