Jason is the eldest son of Eileen Grimshaw (Sue Cleaver) and Tony Stewart (Alan Igbon/Terence Maynard). Jason does not know his father for many years, but they reunite in 2003. Upon his arrival, he is an aspiring runner - something which Eileen does not completely approve of. He works for a brief period in Sally Webster's (Sally Dynevor) electrical shop in 2001 until the failing business catches fire and is permanently closed down. He finds a traumatised Toyah Battersby (Georgia Taylor) lying in the ginnel, following her rape in April 2001, whilst out jogging early one morning.