"Giant-Size X-Men" is a comic book published by Marvel Comics in 1975. It features the first appearance of a new team of X-Men, including characters like Storm, Nightcrawler, and Colossus. The story revolves around the original X-Men, who are unable to rescue their teammate Cyclops and must recruit new mutants to save him from the island of Krakoa. This issue is significant as it revitalized the X-Men franchise, which had been struggling in sales. The introduction of diverse characters and themes helped pave the way for future storylines and the eventual success of the X-Men series in the late 1970s and beyond.