A serial killer dubbed The Scalper' is attacking blonde women, including a friend of Tessa's. MacLeod recognizes the pattern of an Immortal who, betrayed by the woman he loved, became a killer. To end the carnage, MacLeod was forced to confront and kill him, back in 1925. Now the killings have started again, the modern day killer mimicking the 70-year-old M.O., killing in the same locations as the previous murders. It falls to MacLeod and Tessa to stop this madman.
Will’s mother tells Will that she’s broken her engagement to Robert and eagerly awaits her son’s graduation so they can return to Philadelphia together. A shocked Will is afraid to tell her that he wants to attend college in California and remain with his Bel-Air family and friends, and suffers a nightmarish fantasy of what it would be like still living with his mother when he’s 60 years old.
Seeking revenge for the apparent death of her lover, Walter Reinhardt, Rebecca Lord toys with MacLeod before she attempts to kill him with Reinhardt's sword. Rebecca knows nothing of Immortals or their combat, and she believes MacLeod murdered Reinhardt. Unbeknownst to her, Reinhardt is still alive, and is using Rebecca in a cat and mouse game to draw out MacLeod for their final confrontation.
Carlton Banks is very depressed after being rejected by Paula, unaware that she has left him for Will. Meanwhile, Philip and Vivian receive an envelope from their doctor containing an ultrasound picture revealing the sex of Vivian’s fetus. Not wanting to spoil their surprise in the delivery room, they entrust the sealed envelope to their butler, Geoffrey …then curiosity gets the better of them.
Richie Ryan tries to protect an old girlfriend, Nikki, from a band of drug dealers. This puts them both in jeopardy from an Immortal, Voshin, whom MacLeod knows from an adventure during the Second World War when he was trying to smuggle Jewish refugees out of occupied Eastern Europe. Nikki complicates the story by withholding drug money she has stolen from the gang, thinking she can use it to make a better life for her small daughter. Tessa, meanwhile, becomes enamored of the child, raising issues for her and MacLeod.
At Vivian’s Lamaze class, Will cozies up to a pregnant sportswriter, who takes him to a game — and delivers more than just fun.
MacLeod is struck and "killed" by a speeding automobile. When he revives in the hospital, he attracts the attention of a deranged doctor, who kidnaps MacLeod for his research on a miracle cure for trauma. When MacLeod escapes from the doctor, the doctor murders a potential witness and frames MacLeod for it.
Election results are in and Philip fights to remain cool amid lies by Judge Robertson, which prompt Will to confront the outspoken incumbent. Will Will go to far? Will he say what everyone is feeling? Will Judge Robertson be able to take it?
When Tessa is taken by a band of Survivalists who live off the land in the vastness of the Pacific Northwest, MacLeod must call on all of his own skills, honed a hundred and fifty years earlier, when he roamed this same mountain vastness. The leader of these modern day mountain men, Caleb (who is revealed to be an Immortal), falls in love with Tessa, and in the end he and MacLeod battle to the death, axe against sword, against the primitive backdrop of the timeless wilderness.
The Bankses appear on Oprah’s show and fail to invite Will on-stage, which may cause Philip to lose the election.