The Memory Crystal is a magical artifact that allows its user to see into the future but at the cost of losing their own memories. In episode 5, it is central to the plot as it is being used by an ambitious doctor named Stanaris to steal other people's memories, causing memory loss incidents on a college campus with a world-class observatory.

Lisa, a skeptical scientist, initially seeks rational, scientific explanations for the memory loss incidents, while Vikram, a magic expert, suspects supernatural causes. Their debate highlights the classic science versus magic theme, which is resolved when magical evidence convinces Lisa that magic is involved.

The College of Science Observatory is identified as the source of the magical trouble related to the Memory Crystal. The magical 3D map and other evidence point to this location, where the antagonist uses the observatory to align the crystal and steal memories.

The librarians must race against time to save not only the stolen memories but also reality itself, as the misuse of the Memory Crystal threatens a timeline collapse. They also navigate internal team dynamics, such as Lisa and Vikram's differing worldviews, and uncover deeper character backstories, including Vikram's past.

Episode 5 deepens the characters by exploring their contrasting approaches to problem-solving and hinting at Vikram's mysterious past through mentions of a character named Anna. The episode also builds the series mythology by introducing the Memory Crystal and its dangerous powers, setting up future challenges for the team.