Holby City: Sacha joins forces with Hanssen to fend off a threat to the hospital.

SYNOPSIS

Hanssen faces a desperate struggle for Holby's survival, as the prospect of a merger looms on the horizon. All hope is not lost, though, as he receives unexpected support from none other than Sacha, who takes the fight directly to Keller. Meanwhile, an unwanted visitor compounds Donna's problems as she returns to work for the first time since the coroner's court, and a frustrated Matteo tries to find a way to help Oliver get over Zosia.