All characters who appear in season 3 of Roswell, New Mexico.
Main characters[]
Season 3 characters portrayed by the starring cast:
Supporting characters[]
Season 3 characters portrayed by guest-stars.
Recurring guest stars returning from previous seasons:
- Dylan McTee as Wyatt Long
- Tanner Novlan as Gregory Manes
- Christian Antidormi as Forrest
- Rosa Arredondo as Michelle Valenti
- Kayla Ewell as Nora Truman
- Marcel Nahapetian as Young Jones / Young Max
- Cassandra Jean Amell as Louise Truman
- Gaius Charles as Roy Bronson
- Nicholas Ballas as Walt Sanders
Recurring guest stars introduced in season three:
- Steven Krueger as Heath
- David DeSantos as Eduardo Ramos
- Michael Grant Terry as Jordan Bernhardt
- Gillian Vigman as Brooke Taylor
- Quentin Plair as Dallas
- Sibongile Mlambo as Anatsa
- Thomas E. Sullivan as Deputy Pete
- Gavin Houston as Theo
Non-recurring guest stars:
Minor characters[]
Season 3 characters portrayed by co-stars.
Returning from previous seasons:
- GiGi Erneta as Margot Meyerson
- La'Charles Trask as Bert
- Annacheska Brown as Nurse Kate
Recurring, introduced in season three:
- Zacciah Hanson as Zeke Murphy
- Jasmine Gonzalez as Darby
Non-recurring named characters:
- Marisilde Garcia as Mayte
- AJ Voliton as Vinny Lopez
- Morgan Redmond as Alan Winkler
- Santiago Segura as Manny Lopez
- Matthew Menalo as Brock Holmes
- Chris Bylsma as Cody Karman
- Mikael Ayele as Freddie
- Barney Fuller as Doctor Lockhart
- Samuel David Goergen as 12-year-old Heath
- Amir Henderson as 12-year-old Dallas
Unnamed characters:
- Lora Martinez-Cunningham as Therapist
- Jacob Browne as man in suit
- Claire Fort as Paramedic
- Ruben Muller as old farmer
- Jamie Jung as waiter
- Mimi Fletcher as hospital administrator
- RaShayla Daniels as wife
- Koppany Pusztai as guard
- Carl Savering as older geneticist
- Natalie Shields as student
Additional characters[]
Additional:
- Jim Valenti (voice)
- Borrow as Lucky (dog in episode 3.04)
- Patricia DeLuca (infant in Maria's vision)
- Noah Bracken (photograph)
Mentioned:
- Mayor Bernhardt
- Graham Green
- Mimi DeLuca
- Trevor Gunther
- Jesse Manes
- Father Linus
- Ann Evans
- David Evans
- Helena Ortecho