Our universe is facing a threat the likes of which have never been seen before. The "powers that be" have released little information, but we know our world is in jeopardy and must be defended with our lives. To defend our planet against the world's greatest threat to date, I have assembled an ultimate four person team of Earth's All-stars. With their combined power and intellect, I have no doubt that they will be able to save not only the world, but the universe.
Team Leader: Captain Jack Harkness - Doctor Who/Torchwood
Who better to lead a rag-tag group of All-star earth defenders than Captain Jack Harkness? He's lived a couple of lifetimes, seen the end of the world, and has friends in high places. He was the first Time Agent, and reformed and lead Britain's Torchwood after his first time saving the Universe. Having been through both World War I and World War II, Captain Jack Harkness not only knows about saving the Universe, but also about the art of Warfare. He's experienced with Alien Tech as well as traveling through time and space. Oh, and one final thing about Captain Jack? He cannot die. Due to Rose Tyler's absorption of the time vortex, she brought Jack back after he was killed by a Dalek, but she was unable to control the power and brought him back forever. Even if his heart stops beating and he isn't breathing, you just gotta give him a moment to snap back to life. This has also caused him to age much more slowly than your average human.
First Round Pick: Vegeta - Dragon Ball Z
Vegeta, from the Dragon Ball Universe, is the Prince of all Saiyans, an alien warrior race who adapt as their battles progress and become even strong each time they are defeated. Vegeta may be overshadowed by Goku, but he actually has the willingness to do what he must instead of letting his enemies live. Over the years he has become much more fond of earth as a place to live, and thus would never let anything happen to it. He has pushed himself to many levels beyond what he ever thought possible, becoming Super Saiyan, and much later, gaining the power of a god. Being a Saiyan, he is versed in the art of combat. He also knows how to fight using ki and has the power of flight. With moves like Galic Gun and Big Bang, Vegeta will be a force to be reckoned with.
Second Round Pick: Arrow (Oliver Queen) - Arrow/DC Universe
Oliver Queen seemed like a no-brainer. He's a millionaire, so he has the money for any extra technology the team needs. He has also been trained in survival skills, marksmanship, and hand-to-hand combat, among other things. He is an expert archer, with the tech for his arrows to be more than just piercing objects. Of course, he also has connections throughout the upper class, but also in the League of Shadows.
Final Round Pick: Scarlet Witch (Wanda Maximoff) - X-Men/Avengers
Last but not least, I bring you Wanda Maximoff, the Scarlet Witch. We shall call this one the All-stars' fail safe, because really how fair can it be when on your side you have a mutant who can bend the very reality around you? She is a mutant, versed in sorcery, with the magical hexes. She's been part of the Brotherhood of Mutants, alongside her brother and father, and has even been an Avenger. Wanda has learned how to save the world, and while she may not constantly have control of her powers, they would definitely be something that the team may need in a dire time of need.