 Karen Allen portrayed Christa McAuliffe, Kristin Bond portrayed McAuliffe's daughter, Caroline (who was 6 when her mother died), and Kale Browne portrayed McAuliffe's husband, Steven.Allen and Browne were married in real life.Peter Boyle portrayed Roger Boisjoly, the Thiokol engineer most vocal about the danger of launching at extreme low temperatures because of the risk that the O-ring seals in the shuttle's rocket boosters would fail at those temperatures.