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Captain Steven "Steve" Trevor was a United States Air Service officer working for the UK military as a spy, as well as an ally and lover of the superheroine Wonder Woman, being literally the first man she ever met. He had a secretary named Etta Candy. He helped thwart the plans of General Ludendorff, Dr. Poison, and Ares himself, while seemingly sacrificing his life in the process.
Meeting Wonder Woman
- "You're a man..."
"Yeah... I mean... do I not look like one?"
- ―Steve Trevor and Diana[src]
The notebook details a new deadlier form of mustard gas which could annihilate the Allied forces, and win the war for the German Empire. Steve stole a plane from the base to escape with the notebook; however, he was shot down in open sea. He crash-landed near the island of Themyscira. He was saved from drowning by the Amazon princess Diana. As he came to, she asked Steve if he was a man, due to Diana never having come across a male before in her life. Though somewhat confused, Steve affirmed that he was, rhetorically asking if he looked like one. Steve aided Diana and the Amazons defending the beach against a German invasion force where he took down a German soldier and used his rifle to shoot at least two other German soldiers.
After the battle, he was put on trial in front of the Amazons and was questioned. The Lasso of Hestia compelled him to reveal his mission and the fact that he was a spy despite his attempts to resist. While recovering, he was approached by Diana and they eventually escaped the island for London on a boat, in which the pair talked and slept side by side.
Guiding Wonder Woman
When they arrived in London, Steve accompanied Diana through the streets while explaining some things to them such as why people hold hands and then along with his secretary Etta Candy, they went to get Diana new clothes. Steve delivered the notebook to his superiors at high command but they refused to act which seemed to anger Diana. Steve and Diana were leaving where they told them. how they were going anyway and wrapped the Lasso of Hestia around his wrist to prove to Diana that he was, without doubt, telling the truth. 
The following day, Steve along with Diana and and his team of Wonder Men decide to go to No Man's Land. Steve, along with his team, assisted Diana as she block the bullets with her bracelet and her shield. 
Steve and his team then assisted Diana as they fight off against a group of German soldiers, fighting off more Germans invading the Belgian village of Veld, in result, saving the village. After liberating the village from German occupation, a local took a photograph of Steve with Diana and his team.
Steve infiltrated a gathering of Germans during a Gala, but was unable to complete his goal due to Diana. He and his team were then separated from Diana while she fought Ares to destroy the gas. Steve told Diana he loved her and give her his watch. He then boarded the plane storing the gas, fought, defeated two German soldiers and then flew the plane as high as he could. Steve drew his pistol and shot the gas igniting it and destroying the plane preventing the distribution of the gas, supposedly resulting in his own death.
Due to his heroic actions, Steve Trevor was prized with honor.
Nearly a century after Steve's death, the photograph taken in Belgium is eventually discovered by Lex Luthor, who compiles it into his footage of all the other metahumans. The photo is eventually returned to Diana by Bruce Wayne.
Steve displays a softer side after meeting and gradually falling in love with Wonder Woman, explaining to her the customs of humanity, being understanding of her naive social blunders, genuinely admitting his own lack of understanding of some human customs (such as marriage and family life), and eventually starting to tactfully woo her. He soon comes to understand Diana's true potential, and right before he selflessly yet seemingly sacrifices himself (to thwart Ares' plan and finally end the World War I for good), he passionately expresses his unwavering belief in Diana's ability to save the world, as well as his unwavering love for her. Indeed, just as much as Diana had several days prior inspired him, so did Steve's final moments in the Great War before going MIA inspire her, with Diana clinging to their mutual love in order to bypass her ambivalence and violent tendencies, and to defeat Ares for good. Diana's love and respect for Steve's alleged final sacrifice were so immense, that even 100 years later, she would be rendered tearful by the memory of it, and Superman's own actions and sacrifice inspired Diana mainly because she saw a lot of Steve Trevor in him.
- "You know, where I come from, I'm not considered average. You know, being a spy, you have to show a certain amount of vigor."
- ―Steve Trevor[src]
- Peak Human Condition: Steve Trevor, as a highly skilled and experienced pilot and spy, is in top physical condition (though not quite on Batman's level, but still above average as he proclaimed to Diana). Hence, while ambushed unarmed in a London alley by General Ludendorff's spies, Steve was able to beat most of them down quite quickly. He was also fast enough to catch up to the plane filled with mustard gas and hijack it.
- Gifted Intelligence: Steve is exceptionally intelligent (despite his occasional cynicism at new unexpected revelations), which extends to his considerable acting, deception and espionage skills, making Steve Trevor a very valuable spy for British Intelligence. He is notably, however, not as intelligent as Ares who quite easily deceived Steve and his entire team into believing that he was their ally.
- Expert Spy: Steve is an extremely skilled spy, working for British Intelligence, successfully impersonating a German officer and infiltrating Doctor Poison's base in the Ottoman Empire, using the same impersonation to enter General Ludendorff's party in Belgium, expertly imitating a German accent, and almost succeeding in wooing Doctor Poison by impersonating a sadistic and bloodthirsty officer interested in her work (only failing due to getting distracted by Wonder Woman).
- Expert Deceiver: Steve, due to being an experienced, skilled and persuasive liar (at least on par with Sameer, though still surpassed by Ares quite a bit), was claiming to Diana that he lies for a living, was able to see right though Sameer's lying charade in a bar, able to fool his British superiors into believing that he wouldn't go to Belgium (while in actuality, he instead covertly assembled the infiltration Wonder Men team), able to swiftly give Diana the human name "Diana Prince", and the Amazons only get Steve to tell the truth by using the Lasso of Hestia on him (though he notably resisted it for a few seconds).
- Expert Leader: Steve is very capable and charismatic leader, having lead the organized the Wonder Men in the first portion of their mission to defeat General Ludendorff, until Wonder Woman eventually took up the lead as the mission continued from the Belgian trench.
- Expert Pilot: Steve is a highly skilled pilot, successfully escaping pursuing German planes after flying off with Dr. Poison's plans, and crash-landing his plane in the sea outside Themyscira. His skill also extends to water-based vehicles, a she told Diana that he knew how to sail a boat.
- Expert Marksman: Steve is a highly skilled marksman, usually taking German soldiers out with a single shot in World War I battles, thus instantly bringing down Antiope's killer. When he and the Wonder Men reclaimed a German village from Ludendorff's soldiers, he accurately shot a bundle of grenades adhered to a wall, thrown by Chief, to explode the wall and clear a pathway for the Wonder Men to enter the German village. Lastly, he shot the supply of mustard gas on the plane to help end the Great War.
- Skilled Combatant: Steve is fairly skilled in close-quarters combat, notably beating down most of General Ludendorff's spies when he was caught unarmed, and effectively using his gun as a blunt striking weapon when not having sufficient time to take a shot at close-standing enemies.
- Indomitable Will: Steve Trevor has immense determination and strength of will, due to believing in the importance of taking active initiative when one wanted to make a difference, hence Steve disobeys orders from his British Intelligence superiors when he disagrees with them, in order to do what he knows to be right. Despite seeing the many horrors of World War I, Steve refuses to ever hunker down and give up, something he becomes even more adamant about after meeting and fighting alongside with Wonder Woman, who inspires him to act against seemingly insurmountable odds. As a result, Steve was even able to resist the Lasso of Hestia for several seconds, and he didn't hesitate to selflessly sacrifice his own life in order to thwart Ares' plans and end the war for good. Indeed, just as much as Diana had several days prior inspired him, so did Steve's final moments inspire her, with Diana clinging to their mutual love in order to bypass her ambivalence and violent tendencies, and to defeat Ares for good. Indeed, Superman's own actions, willpower and sacrifice inspired Wonder Woman 100 years later mainly because she saw a lot of Steve Trevor in him.
- Mauser C96: Steve Trevor, due to being a British spy impersonating a German officer, is seen using Mauser Pistol on battlefields and missions.
- Mauser Gewehr 1898: Steve took this rifle from a German soldier when he was found on Themyscira, using it to kill Antiope's killer.
- Winchester 1897: Steve's service weapon is a shotgun. He expertly used it during the Battle of No Man's Land and while taking back a German village from Ludendorff's soldiers.
- Colt M1911: Steve drew this pistol when confronting Diana after the latter killed Ludendorff, and used it to shoot the supply of mustard gas in the German plane he stole during his courageous sacrifice.
Behind the scenes
- In the DC Comics, originally Steve Trevor was killed by Doctor Cyber. Seeing Wonder Woman's grief, Eros the God of Love, inhabited Steve's lifeless body and operated as Steve Howard, until his spirit was extracted and Steve "died" again. Several years later, Aphrodite the Olympian God, extracted Steve's essence from Ero's memory and reintegrated it in the body of a Steve from another universe effectively resurrecting Steve Trevor. He later marries Diana. In Post-Crisis, Steve Trevor and Diana are only close friends and Steve went on to marry his secretary Etta Candy. In the New 52, Steve Trevor is alive and well in the modern age and is also the head of A.R.G.U.S.
- Steve Trevor stated his serial number was 8141921.
Behind the scenes
- Before joining the cast as Steve Trevor, Chris Pine was rumored to be considered for the role of Hal Jordan in 2020's Green Lantern Corps.
- Before Chris Pine was casted as Steve Trevor, Liam Hemsworth and Alexander Skarsgård were considered for the role of Steve Trevor.
- ↑ Estimation based on Chris Pine's age during the filming of Wonder Woman (film).
- ↑ ‘Wonder Woman’: First Official Image, Full Cast Revealed
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Wonder Woman
- ↑ 4.0 4.1 Batman v Superman: Dawn of Justice
- ↑ Wonder Woman: Meet the Heroes
- ↑ Wonder Woman 1984
- ↑ Chris Pine Closes Deal to Star Opposite Gal Gadot in ‘Wonder Woman’ (Exclusive) - TheWrap