| It's the day after Halloween in 1988 when four young friends accidentally stumble into an intergalactic battle and find themselves inexplicably transported to the year 2019. When they come face-to-face with their adult selves, each girl discovers her own strengths as together they try to find a way back to the past while saving the world of the future. |
| Name | Character | Episodes |
|---|---|---|
| Sofia Rosinsky | Mackenzie Coyle | 8 |
| Fina Strazza | KJ Brandman | 8 |
| Adina Porter | Prioress | 6 |
| Nate Corddry | Larry Radakowski | 6 |
| Ali Wong | Adult Erin | 5 |
| Jason Mantzoukas | Grand Father | 3 |
| Celeste Arias | Juniper Plimpton | 3 |
| Meg Thalken | Meemaw Radakowski | 3 |
| Christopher Shyer | Ozzie Brandman | 2 |
| Jessika Van | Adult Missy | 2 |
| Cliff Chamberlain | Dr. Dylan Coyle | 2 |
| Jacqueline Williams | Donna Metcalfe | 2 |
| Marika Engelhardt | Jennifer Coyle | 2 |
| Maren Lord | Lauren | 2 |
| Kellee Stewart | Dr. Carol Quilkin | 2 |
| Charin Alvarez | Mother Plimpton | 1 |
| Jennifer Jelsema | Soldier | 1 |