Adam Cross and Tony Diaz
Both of these men were volunteers with the New York Fire Department. After the battle of New York they were called in to support the rebuilding effort. The team took a Chitauri helmet as a trophy of their part in the event. One night they decided to polish it, when they did they contracted an alien virus that caused a fatal buildup of static electricity, which caused them to float in mid air on death. Both men died of the virus, but after inadvertently infecting Jemma Simmonds a cure was found in time to save her, preventing further infections.