Class of 1989, Mike O'Donnell is a star on his high school basketball court with a college scout in the stands and a bright future in his grasp. But instead of pursuing this avenue, he decides to throw it all away to share his life with his girlfriend Scarlett and the baby he just learned they are expecting. Almost 20 years later, Mike's glory days are decidedly behind him. His marriage to Scarlett has fallen apart, he has been passed over for a promotion at work, his teenage kids think he is a loser, and he has been reduced to crashing with his high school nerd-turned-techno-billionaire best friend Ned. But Mike is given another chance when he is miraculously transformed back to the age of 17.