Speak with Marvin the Robot is the second app in the "Marvin the Robot" series that allows you to chat with Marvin. The app is available on Android platform and is free to download. In addition to chat, you can also ask Marvin to provide you with more information about a specific object. For example, if you want to know about an Apple, Marvin will display the image of an Apple on his screen and provide you with relevant information. You can also enlarge the image by clicking on it. The app has various features, and you can use commands like "Define" to define a random object or "Define guitar" to define a specific object. You can also use the "Define nearby" command to define an object near your location. The app is designed to keep all information exchanged with it private and secure.