Linda Danvers' boss, Dr. Barry Metzner, has transformed himself into a future man (what man will become one million years in the future) and poses a threat to Supergirl. Meanwhile, a man from Linda's past has also arrived in town in "The Future Begins Today."
How will Supergirl's adventures end in this, the last story of her amazing ongoing? The answer may shock you!
— Description from Comic Vine community (comicvine.gamespot.com).
