The MCU’s Best Line Is Still the Greatest Quote in Franchise History

Published Nov 8, 2026, 7:44 AM EST Lloyd 'Happy Trails' Farley: the man, the myth, the legend. What can be said about this amazing - and humble - man that hasn't been said before? Or, more accurately, what can be said in public? Born in Calgary, Alberta, Canada, Lloyd is a master of puns and a humorist, who has authored one pun book to date - Pun and Grimeish Mint - and is working on a second. His time with Collider has allowed Lloyd's passion for writing to explode, with nearly 1,000 articles to his name that have been published on the site, with his favorite articles being the ones that allow for his sense of humor to shine. Lloyd also holds fast to the belief that all of life's problems can be answered by The Simpsons, Star Wars, and/or The Lion King. You can read more about Lloyd on his website, or follow his Facebook page and join the Llama Llegion. Happy trails! The MCU is the most successful film franchise in Hollywood history, giving us countless memorable moments — action sequences, quotable scenes, character interactions filled with poignancy and humor, etc. — over the course of its 70+ projects. With such a wealth of options, any argument to be made for one such moment standing as the best in the franchise is likely to be challenged. Oddly enough, being "challenged" just so happens to be the impetus behind the quote that we assert is the greatest in the franchise's history. It's a line that applies to the franchise both on and off the screen, and it's been said more than once by one of the original Avengers, Captain America (Chris Evans), over the course of the franchise's history: "I can do this all day." The MCU's Greatest Quote Captures the Spirit of Captain America The quote is said by Steve Rogers four times over the course of the MCU franchise, with two of those in the film that brought the character into the MCU: Captain America: The First Avenger. The first instance occurs prior to Rogers being given the super serum, where the small and scrawny Rogers is getting beaten up in an alleyway. The attacker is the loud jerk (credited as the "Loud Jerk") Rogers yells at to stop talking during a wartime newsreel shown before a movie. It's no contest: the man is much bigger, and pummels Rogers relentlessly. Only Rogers refuses to stay down, defiantly standing back up and uttering, "I can do this all day." He can't, or at least shouldn't, but he does, with the words capturing the fighting spirit that refuses to give up, whatever the odds; a spirit that made Rogers the perfect recipient of the serum. So when he says it the next time, during his fight with Red Skull (Hugo Weaving), the quote rings differently. Rogers now has the strength to carry it through, changing the quote from one of admirable defiance to a rallying cry. The line rings differently, yet again, the third time Rogers says it, during the final one-on-one fight against Iron Man (Robert Downey Jr.) in Captain America: Civil War. Now it's a statement as to how far he'll go to stick to his morals and beliefs, challenging Tony Stark not only physically but ideally, refusing to back down from either. And when we catch up with Rogers after the events of Avengers: Infinity War in Avengers: Endgame, the same drive represented by "I can do this all day" is routed in a different, compassionate way, with Rogers turning his full attention to helping those left behind. And when his 2012 self says the quote later in the film during the fight with his 2023 self, knowing what the quote means makes the moment quite funny, with the two both unwilling to back down. The MCU's Greatest Quote Applies to the Franchise On and Off the Screen The strongest challenger for MCU's greatest quote is arguably "I am Iron Man" — the line that, for all intents and purposes, began and ended the MCU's Infinity Saga. Only it applies almost exclusively to the man who said it, Tony Stark, and charts his progression from egotist to self-sacrificing hero, whereas "I can do this all day" goes beyond Steve Rogers to apply to the franchise as a whole. Time and again, the protagonists of the MCU refuse to back down from whoever, or whatever, they're up against. The stand to protect New York from the Chitauri in The Avengers. The final battle against Thanos (Josh Brolin) and his overwhelming army in Avengers: Endgame. Confronting the massive, mighty Galactus (Ralph Ineson), despite the four Fantastics together being smaller than his pinky, in The Fantastic Four: First Steps. And so much more. Offscreen, the phrase serves as a meta joke of sorts for the MCU, a franchise that has mirrored Captain America's arc, from a scrawny Steve franchise to what it is today. With Avengers: Doomsday set to extend the franchise's dominance at the movie theater, it's easy to picture Kevin Feige saying those exact words. Through the highs of Avengers: Endgame to the lows of Ant-Man and the Wasp: Quantumania, the MCU keeps standing up again, defiant. So long as the fans continue to come out, to see films that deserve to be seen (sorry, Eternals), Feige and company absolutely can, and will, "do this all day."