Guest Stars Jim Watson as Dr. Theo Hunter Ayisha Issa as Dr. June Curtis Torri Higginson as Claire Malone Laurence Leboeuf as Dr. Magalie "Mags" Leblanc Kenny Wong as Arnold De Luca Sirena Gulamgaus as Amira Hamed Sugith Varughese as Dr. Aajay Singh John Hannah as Dr. Jed Bishop Linda E. Smith as Dr. Wendy Atwater Eddie Guilluame as Lou Eli Shankji as Saleh Grace Lynn Kung as Vivian Barnes Fayçal Azzouz as Khaled Abdullah Charlotte Legault as Melissa Hunter Paul Zinno as Aiden Miller Brittany LeBorgne as Irene Harper Francis Marcil as Tim Stafford Rassil Abdelbari as Boy in Gas Mask Lilou Roy-Lanouette as Layla Harper Leonardo Fuica as Carlos Sabrina Campilii as Cassie Bennett Sara Bradeen as Detective Greggs Anton Koval as Robbie Harper Warona Setshwaelo as Lavondra Kelly André Bédard as Paramedic #2