Warrior: Season 1

San Francisco, 1878. Ah Sahm, a newly arrived Chinese immigrant with serious fighting skills, is introduced to Chinatown's most ruthless tong, the Hop Wei, by Chao, a fixer. After impressing Young Jun, son of tong leader Father Jun, Ah Sahm is branded and taken to a brothel, where he befriends Ah Toy, a courtesan with connections. Later, in search of a woman who left China two years earlier, Ah Sahm crosses paths with Mai Ling and Li Yong, followers of the rival tong leader Long Zii, who is trying to avoid an opium war with the Hop Wei, a war that Walter Buckley, deputy to San Francisco Mayor Samuel Blake, actively promotes. Meanwhile, after two Chinese laborers are killed by white thugs, police sergeant "Big Bill" O'Hara is tasked with creating a Chinatown squad. Enlisting southern-born cop Richard Henry Lee, Bill soon finds that the hostility between the Chinese and white dock workers, whose unofficial leader is Irish tough Dylan Leary, is unlikely to end anytime soon.

Intercepting a shipment of opium at the docks, Young Jun with Ah Sahm and his Hop Wei lieutenant Bolo in tow decides to send a message to Long Zii. Big Bill and Lee investigate a grisly murder scene in an alley next to an Irish bar The Banshee. Penny Blake, the young wife of San Francisco's mayor, finds herself in a bind while visiting the wharf with her Chinese valet, Jacob. Ah Sahm pays a steep price for playing the hero. The Long Zii clean up a mess and brace for more bloodshed.

Accused of assault, Ah Sahm gets a cold shoulder from the Hop Wei, with his fate in the hands of an unexpected ally; Buckley urges Mai Ling to eschew restraint and start a war with the Hop Wei.

Big Bill discovers a possible solution to his gambling excesses; Penny reveals the circumstances that prompted her to marry Mayor Blake; Mai Ling offers Ah Sahm a way out of a protracted and bloody tong war.

Ah Sahm and Young Jun are forced to spend the night with three strangers at a frontier saloon, until the detour turns perilous when a notorious outlaw appears looking for a lucrative payday.

Tensions escalate between the Hop Wei and Long Zii after an assassination attempt; Big Bill sets out to pay his debt to Jack; Blake and Buckley get a mandate from Robert Crestwood.

Father Jun sends Bolo to hunt down Long Zii and Mai Ling; Penny is faced with an unsavory choice; Lee's past catches up with him.

After a bloodbath, the Hop Wei and Long Zii consider a novel way to end hostilities; Ah Toy and her business partner hit a fork in the road; Mai Ling warns her brother against waging a battle he may not win.

Chinatown gathers to witness a "prize fight" between elite warriors from the Hop Wei and Long Zii. Buckley plays a bluff in hopes of getting Mercer to lower his fee. Ah Sahm remembers his roots as a fighter as Ah Toy warns him of the dangers that await. Bill and Lee question Wang Chao about the recent sword killings in San Francisco.

Ah Sahm rejects his warrior roots. Leary pays a violent visit to Mercer.