1. The Avengers - A team of superheroes who come together to protect the world from threats that no single hero can handle. Members have included Iron Man, Captain America, Thor, Hulk, Black Widow, and Hawkeye.
2. The X-Men - A team of mutants who fight for peace and equality between humans and mutants. Members have included Wolverine, Cyclops, Jean Grey, Storm, Rogue, and Gambit.
3. The Fantastic Four - A family of explorers who gain superpowers after being exposed to cosmic rays. Members include Mr. Fantastic, Invisible Woman, Human Torch, and Thing.
4. The Guardians of the Galaxy - A team of misfits who protect the galaxy from intergalactic threats. Members include Star-Lord, Gamora, Drax the Destroyer, Rocket Raccoon, and Groot.
5. The Spider-Man Family - A group of heroes who are all connected to Spider-Man in some way. Members include Spider-Man, Miles Morales, Spider-Gwen, Ghost-Spider, and Venom.
6. The Defenders - A team of heroes who come together to defend the streets of New York City. Members have included Daredevil, Luke Cage, Jessica Jones, Iron Fist, and Elektra.
7. The Champions - A team of young superheroes who fight for social justice and equality. Members include Ms. Marvel, Miles Morales, Nova, Sam Alexander, and Viv Vision.
8. The Illuminati - A secret society of powerful heroes who come together to make decisions that affect the entire Marvel Universe. Members have included Iron Man, Doctor Strange, Professor X, Black Panther, and Namor.
9. The Squadron Supreme - A team of heroes from an alternate universe who are similar to the Justice League from DC Comics. Members have included Hyperion, Nighthawk, Power Princess, Doctor Spectrum, and Whizzer.
10. The Young Avengers - A team of young heroes who are the successors to the original Avengers. Members have included Hawkeye, Hulkling, Wiccan, Speed, Patriot, and Miss America.
These are just a few of the many teams that exist in the Marvel Universe. With so many heroes and villains to choose from, there's sure to be a team that everyone can enjoy.