Angel, Havok and Colossus are all members of which superhero group?

The X-Men are a team of mutant superheroes, published in comic books by Marvel Comics. Over the decades, the X-Men have featured a rotating line up composed of many characters.

Warren Kenneth Worthington III, originally known as Angel and later as Archangel, is a fictional superhero appearing in American comic books published by Marvel Comics and is a founding member of the X-Men. Created by writer Stan Lee and artist Jack Kirby, the character first appeared in "The X-Men" #1 (September 1963).

Havok (Alexander Summers) is a fictional character appearing in American comic books published by Marvel Comics, commonly in association with the X-Men. He first appears in "The X-Men" #54 (March 1969), and was created by writer Arnold Drake and penciller Don Heck.

Colossus (Piotr "Peter" Nikolayevich Rasputin) (Russian: Пётр Николаевич Распутин) is a fictional character appearing in American comic books published by Marvel Comics. Created by writer Len Wein and artist Dave Cockrum, he first appeared in "Giant-Size X-Men" #1 (May 1975).