The Big Guy and Rusty the Boy Robot(1999)

The Big Guy and Rusty the Boy Robot is an animated series following an elite fighting robot that protects New Tronic City from terrestrial and extraterrestrial threats. When the original Big Guy is decommissioned, a smaller, childlike robot named Rusty takes over the role—but quickly discovers he's outmatched without his predecessor's support. The two robots must learn to work together to defend the city and keep the world safe. The show blends action and humor as the unlikely pair navigate their partnership, combining the seasoned expertise of Big Guy with Rusty's earnest determination and growing capabilities.