Headteacher of Waterloo Road Comprehensive, Jack Rimmer, hires Oxbridge graduate Andrew Treneman, hoping he can improve the school's failing status and bring them back from the bottom of the league tables. Meanwhile, colleagues Tom and Lorna tie the knot - but the groom ends up kissing someone who isn't his new wife.

The aftermath of the car crash affects the entire school. Lorna announces her pregnancy to her new husband, but he isn't so sure he wants a child. And things begin to heat up between Steph and Jack.

A pupil gives birth at the school, but who is the father? Could it be one of the teachers? Lorna terminates her pregnancy behind her husband's back, against Izzie's advice, but Tom changes his mind, and decides he wants the now-aborted baby. Andrew implements a house system with disastrous consequences.

Izzie's ex-husband, Jimmy, causes chaos at the school when he demands access to their children, and Tom confronts Lorna about her apparent miscarriage. Meanwhile, the pupils set up a scam to gain more points in the new house system, but it isn't long before their scheming plot is uncovered. Jack wonders about the sudden improvement in the grades gained by Steph's French class.

Lorna tries out a sexy new image in a bid to catch Tom's attention, while the Head of the English department, Grantly Budgen, suspects one of his students may be taking drugs and approaches Andrew for help. Chlo takes drastic action to convince everyone, including Donte, she was driving on the night of the crash, and Steph stages a break-in to get rid of the suspicious coursework and avoid losing her job, but doesn't do a very good job of it.