In the eighth episode of "Criminal Minds: Evolution" titled "Forget Me Knots", fans were hit by a wave of nostalgia with the reappearance of JJ's elder son, Henry, who had grown perceptibly since his last stint in "Criminal Minds" Season 15. Evolving from a tiny tot to a teenager, bearing a striking resemblance to his mother not just in looks but also her profiling skills, the impact was made even more profound by the fact that Henry is played by A.J. Cook's real son, Mekhai Andersen, making the evolution feel like a time capsule in its own right. To witness just how much he's grown and come into his own...let's roll the video.