![Fermi entering molecular reversion field, remastered](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/0/03/Fermi_entering_molecular_reversion_field%2C_remastered.png/revision/latest/scale-to-width-down/180?cb=20190331223301&path-prefix=en)
The Fermi caught in a molecular reversion field
![Molecular reversion field diagram](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/7/72/Molecular_reversion_field_diagram.jpg/revision/latest/scale-to-width-down/180?cb=20190331231304&path-prefix=en)
Diagram of a molecular reversion field
A molecular reversion field was a spatial anomaly that could interfere with transporter patterns and the molecular structures of objects passing through it.
In 2369, the shuttlecraft Fermi was trapped in and destroyed by such a field. Traveling aboard the shuttle were Captain Jean-Luc Picard, Ensign Ro Laren, Keiko O'Brien, and Guinan. As the shuttle began to break up, the USS Enterprise-D attempted to beam them off the shuttle. The molecular reversion field obscured portions of their patterns, in particular the rybo-viroxic-nucleic structure of their DNA, and the transporter re-materialized all four without it. (TNG: "Rascals")