Bart Allen

Hit by lightning which gave him amnesia, his powers & sent him to the year 2004
2004: Saved the life of Jonathan Kent, stole the man's wallet & met Clark Kent
2005-2006: Met Oliver Queen, who took him in, joined his team of superheroes
2007: Captured and imprisoned during a mission to a LuthorCorp facility, rescued by Clark
2011: Confronted by the Black Flash, battled art thieves in Paris, gave his life to destroy the Black Flash