Immortal Duncan McLeod is maintaining a peaceful existence with the love of this life, Tessa Noel when he is challenged to Immortal combat by Slan Quince, an evil Immortal. An old friend and clansman, Connor MacLeod, comes to try and convince Duncan to once more join the fray in the battle of Good versus Evil. Duncan also meets Richie Ryan, a kid from the streets whom he befriends after catching him breaking into his antique store.
2. Season 1, Ep 2: Family Tree
Richie tries to track down his parents and runs afoul of a female crime boss, and Duncan comes to his help while pondering his own life among the MacLeods.
3. Season 1, Ep 3: Road Not Taken
Richie's friend dies of an overdose of a herbal drug and MacLeod suspects the source of the drug is another Immortal, Kiem Sun. Sun has has long sought to perfect such a drug and remove its lethal side effects for the betterment of mankind. But a disciple of Kiem Sun's is using the drug for his own gain, and MacLeod and Sun must track him down. When it becomes clear that Kiem Sun plans to continue his experiments despite the dangers, MacLeod destroys the remaining sample of the drug.
4. Season 1, Ep 4: Innocent Man
A homeless mortal is wrongfully accused of the murder of an Immortal after investigating a bizarre thunderstorm surrounding a cabin. Duncan determines to prove the homeless man's innocence and bring the real murderer to justice.
5. Season 1, Ep 5: Free Fall
A beautiful young woman, Felicia Martins, throws herself to her death, only to revive with the realization that she is an Immortal. She seeks out Duncan MacLeod as her mentor, and becomes amorously involved with Richie Ryan. But there is much more to this ingénue than meets the eye. She is in fact a long-time Immortal, engaged in a wily scheme to trap MacLeod and acquire his Quickening. MacLeod must see through her subterfuge in time to protect not only himself, but also Richie.
6. Season 1, Ep 6: Bad Day in Building A
While visiting the courthouse to clear up Tessa's traffic tickets, MacLeod, Tessa, and Richie are among a group that is taken hostage by a band of men bent on freeing their leader, Slade, from imprisonment. When Slade's demands are not met, he chooses a hostage to sacrifice. MacLeod makes sure that hostage is himself, and returns from the dead to hunt down the gunmen one by one, as the police watch helplessly from outside.
7. Season 1, Ep 7: Mountain Men
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 fastness. 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.
8. Season 1, Ep 8: Deadly Medicine
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.
9. Season 1, Ep 9: The Sea Witch
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 Russian Revolution when he was trying to smuggle Russian nobles out of the country. 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.
10. Season 1, Ep 10: Revenge is Sweet
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.
11. Season 1, Ep 11: See No Evil
When a serial killer preys on beautiful blonde women, Duncan becomes involved when Tessa's friend is targeted...and recognizes the pattern as that of an Immortal he killed 80 years ago.
12. Season 1, Ep 12: Eyewitness
Tessa claims to see a woman murdered, but there's no body and only Duncan believes her. Duncan realizes that an Immortal is behind the killing...the chief of detectives who is in charge of the investigation.
13. Season 1, Ep 13: Band of Brothers
Darius, an ancient Immortal, priest, and friend of Duncan's, sends word that his one-time protege and master swordsman, Grayson, is now stalking Darius' other students -- among them, possibly, MacLeod. Grayson, disillusioned that his former comrade-in-arms has become a man of peace, is killing Darius' mortal students to gain revenge. Grayson goes after peace activist Victor Paulus and Duncan must protect him despite the fact that Grayson is his superior in swordsmanship.
14. Season 1, Ep 14: For Evil's Sake
Kuyler, an evil Immortal and professional assassin, has run across Duncan in the past and their paths cross again in modern-day Paris when Kuyler employs a band of killer mimes. Duncan must defeat Kuyler to protect his current targets and enact justice for the man Kuyler killed under Duncan's protection over a hundred years ago.
15. Season 1, Ep 15: For Tomorrow We Die
MacLeod encounters Xavier St. Cloud, a ruthless Immortal who uses poison gas to commit his robberies and killing anyone who gets in his path. Meanwhile, Richie falls for a glamorous older woman, unaware that she's married, and Tessa must help him out.
16. Season 1, Ep 16: The Beast Below
A mysterious death at the Paris Opera re-acquaints Duncan MacLeod with one of the strangest Immortals he has met in his many travels over the centuries. Ursa is a hulking giant -- more beast than man -- who Duncan rescued from persecution centuries ago, delivering him to sanctuary in an abbey. The abbey has long since been destroyed and Ursa now lives under Paris. He has become enamored of a past-her-prime opera singer who tries to use Ursa's innocent soul to murder her rival.
17. Season 1, Ep 17: Saving Grace
Grace Chandel has been a good Immortal, working for the betterment of mankind as a midwife, doctor, and scientist over the centuries. Her one weakness is another Immortal, Carlo Sendaro, a former lover who is obsessed with her and refuses to let her go. He slays Grace's current (mortal) lover and, when she refuses to run off with him, frames her for the killing. She turns to her old friend Duncan MacLeod for help.
18. Season 1, Ep 18: Lady and the Tiger
A day at the circus reunites MacLeod with a former lover, the Immortal femme-fatale, Amanda, who has always meant big trouble for him. Amanda, meanwhile, is in trouble of her own as her former partner, Blaine, has escaped from prison and wants her head. She plays the two Immortal men against each other, drawing MacLeod into a daring, high-stakes burglary she and Blaine are plotting.
19. Season 1, Ep 19: Eye of the Beholder
Richie becomes involved with a woman who is a model for another Immortal, Gabriel Piton, who is an old friend of Duncan's.
20. Season 1, Ep 20: Avenging Angel
A deluded new Immortal believes that he has been chosen by God to crusade against evil and perversion, and one of his target's is an old friend of Tessa's.
21. Season 1, Ep 21: Nowhere to Run
When the stepdaughter of an Immortal is raped, the Immortal comes after the young man. MacLeod, a guest in the home of the accused boy's father, feels he must protect the family from this unstoppable menace. He urges the Immortal to see due process done, but the man has no interest in listening to reason, and he lays siege to the house.
22. Season 1, Ep 22: The Hunters
Immortal are mysteriously dying their final death...and Darius is their next target.