This episode of Marvel Studios Legends details how important the tesseract was in the MCU before Loki season 1 released. Like the preceding episode about Loki, it is a teaser for Loki season 1. It is the first episode to be about an item rather than a particular character. The Tesseract was a pretty important item in the Infinity Saga as it was composed of the space stone and was often the motivation of Loki. That's why the Tesseract could be considered a Legend. It was a big part of Loki's story, as why this episode was added before Loki Season 1, having more of what you need to know before Loki Season 1. The Tesseract might not have played a big role in the show Loki but it played a big role leading up to it. This series is pretty much what you need to know about a particular character, object, or group that will play a role in the beginnings of a new project in the MCU through clippings of previous projects. This episode does expand the Marvel Studios Legends series that it could not just be about a particular character but a particular object. I believe that's what expanded into episodes about organizations/groups. This is the only episode to be more about a particular object. Don't know, we might get a future episode more about a particular object down the line.