La Esfera parte de una premisa real. Varios pilotos del ejército americano han publicado una carta en el New York Times haciendo público que llevan años viendo objetos voladores no identificados en sus maniobras de vuelo.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 1 | April 2021 | May 2021 | 8 |
| Season 2 | March 2023 | May 2023 | 8 |
| Unassigned Episodes | 8 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 24 |
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