 Martin is starting to feel old and needs to go through the typical Martian process of rejuvenation, which is accomplished through a special light. With Tim s help, Martin does go through the process, however he is under the effects of the light too short a time and reverts into the physical equivalent of a baby. Before Tim gets Martin back under the light, Det. Brennan comes by and Tim tells him a story that the baby was abandoned. The detective takes the baby into custody to the hospital nursery as a ward of the state. Tim needs to get the light down to the hospital and change Martin back, but he first has the problems of mistaken baby identities which results in a adult formed baby who goes missing, a gauntlet of nurses protecting baby Martin, and of course a meddlesome Det. Brennan.