After leaving the capsule, head right and wait until the doctor goes out. There is a to-do list on the wall behind the generator. Take the paper, which will turn out to be a super-battery blueprint. Shortly after that, Dr Fred will appear and will take the blueprint from you. He will demonstrate to you how to send items to friends using the time capsule. After watching a cut-scene, the game will transport you to the prenest and you will take control over Hoagie. NOTE! From now on, you can switch between these two characters as you please. To do that, simply click the icon of a given character located on the right side of the inventory menu.
Your first task in the past is to give the super-battery blueprint to Dr Fred's ancestor named Red Edison. To do that, follow the path on the left and you will reach a nearby motel. Open the door and go inside. You will find yourself in the same building in which you started the game, but 200 years earlier. There is a mummy of Fred's deceased cousin (known from Maniac Mansion) behind the reception desk. You can try to talk to him, but you will surely fail.
Approach the grandfather clock. Open it and go inside to reach Red Edison's lab. Take a left-handed hammer from the desk near the stairs. You will notice a lab coat on the stand. You cannot take it now. Give the patent application to Red Edison. You will learn that the scientist will need oil, vinegar and some gold.