Casualty viewers were baffled by a 'mistake' over Rash Masum's age during a flashback scene that showed the doctor back in his school days. In the latest Casualty episode, a special double-bill to be screened on Saturday, 23 March, Tariq will be seen offering his support to a devastated Rash, while Rida questions her future after a catastrophic incident rocks her relationship with him. It comes after last week's heartbreaking episode which saw the departure of original cast member Derek Thompson, who played Charlie, leaving fans sobbing.