^ Doctor Octopus is regarded as one of Spider-Man's worst enemies and archenemy. He has been cited as the man Peter might have become if he had not been raised with a sense of responsibility. He is infamous for defeating him the first time in battle and for almost marrying Peter's Aunt May. He is the core leader of the Sinister Six and has also referred himself as the "Master Planner". ("If This Be My Destiny...!") Later depictions revealed him in Peter Parker's body where he was the titular character for a while.
An issue of What If? asks the question "What If Spider-Man Had Kept His Cosmic Powers?" Spider-Man becomes corrupted by power when the Captain Universe energies decide to stay with him. He ends up battling his Avengers friends when they don't agree with his methods. A confrontation with a rogue Doombot leaves an innocent hostage dead. Peter manages to give up the entirety of his powers, including his spider-ones. Later, Peter's child manifests a combination of Captain Universe and Spider-Man powers.
Halloween costumes are costumes worn on or around Halloween, a festival which falls on October 31. An early reference to wearing costumes at Halloween comes from Scotland in 1585, but they may pre-date this. There are many references to the custom during the 18th and 19th centuries in the Celtic countries of Scotland, Ireland, Mann and Wales. It has been suggested that the custom comes from the Celtic festivals of Samhain and Calan Gaeaf, or from the practise of "souling" during the Christian observance of Allhallowtide. Wearing costumes and mumming has long been associated with festivals at other times of the year, such as on Christmas. Halloween costumes are traditionally based on frightening supernatural or folkloric beings. However, by the 1930s costumes based on characters in mass media such as film, literature, and radio were popular. Halloween costumes have tended to be worn mainly by young people, but since the mid-20th century they have been increasingly worn by adults also.