In the drama Legends , a “legend” means the undercover agent’s fake identity or cover story, not a famous person. The show uses this term for the new persona Customs workers adopt to infiltrate drug gangs.

In a broader literary sense, a legend is also a traditional story passed down as history, often about a person or place. So the word in the drama is a spy term, while the general meaning is a storytelling term.

In the show

  • A legend = an invented backstory and identity for undercover work.
  • It helps the agent blend in and stay secret.
  • The title of the series refers to those hidden identities.

General meaning

  • A legend is a story told as if it were historical fact.
  • It can also mean a very famous or admired person.

If you want, I can also explain the plot of Legends in simple terms.