Sam is trying to come to terms with the fact he's got cancer. There's a surgeon shortage so when news comes of a major train crash, Sam throws himself into his work, regardless of his plight. When his patient dies in theatre, Sam struggles to deal with the emotional side of the job with the knowledge of his illness. Later, Sam decides to shave off all his hair in anticipation of losing it all when he undergoes chemotherapy. Meanwhile, Mark is stressing over the staff shortage. When he suspects that a patient from the train crash is a terrorist, Elliot realises that Mark's paranoia is caused by his drug problem. At the end of the day, Mark calls his dealer for another fix. Elsewhere, there is tension between Donna and Jac as they both fight for Michael's attention. VIDEO: Watch a preview of Holby City
