'Learning Curve'

Sam is not faring well following his positive test result for cancer, as the medical drama continues. A combination of a surgeon shortage at the hospital and a major train crash means that he still has to work, regardless of his plight.

In theatre his patient dies and he finds it difficult to handle the emotional side of the job with the knowledge of his illness. Maddy is supportive but Sam decides to shave off all his hair in anticipation of losing it all through his forthcoming chemotherapy.

Mark, meanwhile, is stressed due to the staff shortage. He becomes suspicious that a patient from the train crash is a terrorist, but Elliot realises that Mark's paranoia is caused by his spiralling drug problem. Mark calls his dealer at the end of the day to get yet another fix.

Elsewhere, there is tension between Donna and Jac as they both fight for Michael's attention.