The Skrulls are a fictional alien race in the Marvel Comics universe, known for their ability to shapeshift and mimic other beings. They first appeared in 1962 and are often depicted as adversaries of the Fantastic Four and Avengers. Their green skin and pointed ears are characteristic features, but their true appearance can vary widely due to their shapeshifting abilities. Skrulls are part of a larger intergalactic conflict, often clashing with the Kree, another alien race. The Secret Invasion storyline highlights their infiltration of Earth by impersonating superheroes, raising questions about identity and trust. Their complex nature makes them intriguing characters in the Marvel narrative.