Crossing The Line is the 2378th episode of The Bill.
An off-duty Sgt Stone sees a couple arguing. When the man starts to hit the woman, Stone intervenes, but is badly beaten. Jo interviews the woman, who claims she was the victim of a random mugging and doesn't want to make a statement. New PC Kirsty Knight and PC Ryder uncover a relationship between the man and the woman's son, but when there is insufficient evidence to prosecute, Callumdecides to take the law into his own hands and beats Hardacre to a pulp. Jo confronts Stone about the attack but he denies all knowledge, with no evidence, Jo leaves. Back at the station Jo tells Smithy the case will just get NFA'd.
- Sam Callis as Sgt Callum Stone
- Sally Rogers as Sgt Jo Masters
- Alex Walkinshaw as Insp Dale Smith
- Sarah Manners as PC Kirsty Knight
- Rhea Bailey as PC Mel Ryder
- Micah Balfour as PC Benjamin Gayle
- Lucy Speed as DS Stevie Moss
- Chris Simmons as DC Mickey Webb
- Christopher Fox as DS Max Carter
- Amita Dhiri as DC Grace Dasari
- Patrick Robinson as DC Jacob Banks
- John Bowler as PC Roger Valentine
- Ben Richards as PC Nate Roberts