HBO has debuted the first trailer for the five-part mini-series Parade's End, which debuts with "Episode 1" and "Episode 2" airing back-to-back on Tuesday, February 26 at 9 PM ET. Benedict Cumberbatch (Sherlock, Star Trek Into Darkness) stars as Christopher, a British aristocrat who gets caught up in a torrid love triangle with his unfaithful wife (Rebecca Hall) and a fearless young woman (Adelaide Clemens). Take a look at the first footage, then read the official press release for more details.

From the reliable comforts of Edwardian England to the chaos and destruction of the First World War, the early 20th century was a defining era in history, a time of unprecedented change, when old certainties were being torn down. The long golden afternoons of the pre-war years would be shattered by the most destructive war the world had ever known, and countless lives would be changed forever.

Set against this backdrop of impending catastrophe is the story of English aristocrat Christopher Tietjens, trapped in a marriage to an unfaithful wife, and caught between his commitment to the values of Toryism and his unspoken love for a fearless young suffragette.

Spanning the glittering, shallow world of London high society, the trench-scarred battlefields of France, and the breathtaking English countryside, the sweeping five-part HBO Miniseries presentation Parade's End debuts Tuesday February 26 (9:00-11:05 p.m. ET/PT), Wednesday February 27 (9:00-11:05 p.m.) and Thursday, February 28 (9:00-10:00 p.m.), exclusively on HBO. Adapted from Ford Madox Ford's groundbreaking novels by Sir Tom Stoppard (Oscar-winner for Shakespeare in Love), the drama was directed by Susanna White (HBO's Emmy-winning Generation Kill).

Benedict Cumberbatch (Sherlock, War Horse, Rebecca Hall (The Town, The Town) and Adelaide Clemens (The Great Gatsby) star in The Great Gatsby, a Mammoth Screen production for the BBC in association with HBO Miniseries and Trademark Films and BBC Worldwide and Lookout Point; co-produced with BNP Paribas Fortis Film Fund and Anchorage Entertainment; filmed with the support of the Belgian federal government's Tax Shelter Scheme. The executive producers are Michele Buck and Damien Timmer for Mammoth Screen, Ben Donald for BBC Worldwide, Simon Vaughan for Lookout Point TV, no_pereson|Judith Louis for ARTE France and Tom Stoppard. David Parfitt and Selwyn Roberts produce.

Parade's End also stars Roger Allam (The Queen), Anne-Marie Duff (The Virgin Queen), Rupert Everett (The Importance Of Being Earnest), Stephen Graham (HBO's Boardwalk Empire), Janet McTeer (Albert Nobbs) and Miranda Richardson (The Lost Prince).

Married to Sylvia (Rebecca Hall), a callous socialite who has given birth to a child that may not be his, English aristocrat Christopher Tietjens (Benedict Cumberbatch) becomes entranced by Valentine Wannop (Adelaide Clemens), a fearless young woman who unexpectedly turns his world upside down. As warbreaks out across Europe, Christopher, compelled by an outmoded code of conduct, feels obligated to remain loyal to his wife as he leaves a heartbroken Valentine to fight in France.

Christopher struggles to adapt to his new life as an army officer. When he returns to England briefly, suffering from shell shock, he is alarmed to discover himself the target of vicious rumors. Rejected by his father and brother, alienated from Sylvia, with only Valentine to support him, he attempts to hold on to sanity and meaning as the old world order collapses amidst tremendous upheaval.

Through Christopher's experiences, Parade's End captures the devastation of war and the end of Edwardian ideals, and bridges the gap between feudal England and the dawn of modernism.