Season 2 Episode 1: Features a dark version. Sonya shoots Travis pointblank a total of six times in the heart, and he later dies on the operating table despite the doctor's attempts to use the Magical Defibrillator. But oops, turns out he's got a built-in version, which wakes him up. He proceeds to slaughter the majority of the medical staff before succumbing to his injuries again, all while screaming Sonya's name.
Season 2 Episode 10 (Second Wave): Julian averting his destiny by explicitly renouncing a violent end to Kiera while proving to his group why he's their leader.
Theseus demonstrating what he thinks of the slave labor camps of the future, rescuing someone along the way.
Emily fights Travis hand to hand, and actually manages to mildly annoy him. That might not sound like much, but it's more than the cops, a prison riot, and every single gang in the city ever managed. She would have done better if she had known he was a super-soldier, since she would have skipped the warning shot and gone straight for the kill.
Season 2 Episode 12 (Second Time): Kiera getting the best of Travis on the elevator.
Season 3, Episode 1 (Minute to Minute): Kiera and Garza teaming up against the Freelancers in the stairwell in a marvelously choreographed fight scene.
Again in "Minute to Minute" when Emily eliminates Escher via Boom, Headshot! in Alec's new timeline.
In "A Minute Changes Everything", a Past!Alec Sadler wowing the board of directors with his on-point talk after he'd earlier flubbed it reading off index cards.
For a few moments in "3 Minutes to Midnight", Liber8 realizes they actually pulled off changing the timeline to get rid of the Corporate Congress. That bit of awesome immediately gets sunk like a lead brick when they find out it led to an even worse timeline than the one they had inhabited.
The fact that Kellog, the least physical yet most weaselly member of Liber8, is the one who ultimately survives all that horror. Not only that, he then steps up and puts a plan in motion to fix it.
Alec stabbing a Freelancer with a pen. He didn't manage to kill the guy, and in fact the guy just pulled it out like he was removing a splinter, but it was still pretty badass.
Sonya concealing explosives within her skin to take out Dillon without him in the least suspecting it.
Practically the entire Season 3 finale. Kiera's speech, in particular, saying she doesn't have to agree with Liber8 but she will work to make a better timeline than she herself knew. The only thing Travis needs to say in response is: "Let's get to work."
The entirety of the double fight scene at the end of Rush Hour. On one side you have Emily beating two large professional thugs to death with a chair (or, by the end, parts of a chair); on the other side you have Carlos going toe-to-toe with Travis. Awesome for Carlos because he manages to hold his own against an implacablesuper-soldier; awesome for Travis because, despite having just crawled out of a car wreck and then being shot repeatedly, he still wins.
In Final Hour, The Reveal that Alec Sadler had Kellog's measure well enough to fool him into setting a destination date well into the past on his Timey-Wimey Ball, destroying the 2039-invasion timeline in the process and ensuring he could not cause any more problems in building a better 2077.