1 | Charlie |
| Jason's son. |
| Daniela |
| Jason's wife. A painter. aka: Dani Varcas. |
| Ryan |
Holder | Jason's college buddy. A neuroscientist. Won the Pavia Prize. |
| Jason Ashley |
Dessen | Narrator. Protagonist. Atomic Physicist. A teacher. |
| |
| The EL - A dark place, street. |
2 | Leighton |
Vance | Chief Executive and Medical Officer. Jason's colleague and friend. |
| Amanda |
Lucas | Jason's therapist. A psychiatrist. |
| Chad |
Hodge | An employee at Velocity Laboratories. |
3 | Randolph |
| Attending physician at Mercy Hospital. |
| Barbara |
| Nurse. |
5 | Juliane |
Springer | Randolph's colleague. |
| Ralph |
| The guy who picked up when Jason tried dialing his wife's number. |
| Randall |
Dessen | Jason's father. |
| Ellie |
Dessen | Jason's mother. |
| Michael |
Dessen | Jason's brother. |
| Steve |
Konkoly | Producer. |
8 | Matthew |
Snell | The first guy who used the box. |
10 | Nadia |
| The girl who was with Mike. |
| Mike |
| The driver who helped Jason out. |
13 | Gary |
| The man who was working at the gun shop. |
| Nick |
| Restaurant Manager. |
| Officer |
Hammond | Police officer. |
14 | Joel |
| Charlie's friend. |
| Angela |
| Charlie's girlfriend. |