In the first episode of this two-part special, a new arrival in the form of Professor John Gaskell (Paul McGann) sets the wheels of change in motion at Holby City.
With all the focus on Gaskell, Sacha relays his concerns to Henrik that he should be focusing on Jac as she faces mounting pressure on her professional and personal life.
However, Gaskell’s arrival and concerns for Jac both soon become overshadowed as Holby is plunged into darkness with the greatest threat the hospital has ever experienced.
Meanwhile, Raf is reminded of why he fell in love with medicine. Is his new-found passion here to stay?
Holby is back on Thursday