"Best Friends Are Forever" is an episode of Special Agent Oso.
Oso agrees with Dotty to help set up the new moon beacon. Dotty tells Oso to bring her the last piece to put the beacon together. Oso tries looking for the piece, but he brings the incorrect one. A special alert is called. A girl named Madison is sad because her best friend, Aaliyah, is moving away. So Oso decides to help Madison say goodbye to her best friend before she moves to her new home.
- The episode's title is a reference to the James Bond film Diamonds Are Forever.