To celebrate its 200th and final episode, ABC’s Extreme Makeover: Home Edition will reveal seven homes for seven families who lost theirs to the tornado that devastated the city of Joplin, Mo., last May. In what producers say is one of the largest projects ever undertaken by the reality show, Extreme Makeover: Home Edition¬—along with thousands of volunteers—successfully re-built the houses in just seven days. The episode will air this Friday, Jan. 13, at 8 p.m. ET/7 p.m. CT on ABC.