The POstables leads an investigation that takes them on the road not only to find the recipient of a lost letter, but also to track down a rock star who holds the keys.
| Actor | Role |
|---|---|
 Eric MabiusOliver | Oliver |
 Kristin BoothShane | Shane |
 Yan-Kay Crystal LoweRita | Rita |
 Geoff GustafsonNorman | Norman |
 Rhiannon FishCharley | Charley |
 Gregory HarrisonJoe O'Toole | Joe O'Toole |
 Natalie SharpTracy / Lily (18 yrs) | Tracy / Lily (18 yrs) |
 Zak SantiagoRamon Rodriguez | Ramon Rodriguez |
 Kehli O'ByrneCamille/Margot | Camille/Margot |
 Remy MarthallerAmber (8 yrs, 12 yrs) | Amber (8 yrs, 12 yrs) |
 Gabrielle HankeyAmber (18 yrs) | Amber (18 yrs) |
 William WilderNate Holloway | Nate Holloway |
 Victor DolhaiHans | Hans |