Noo-Noo (operated by Mark Dean in the original series and Victoria Jane in the new series) is the Teletubbies' sky blue pet. He is in Teletubbyland as a type of vacuum cleaner. He never leaves the House in the original series. He doesn't speak like Teletubbies can; he makes sucking and slurping noises. At times, Noo-Noo gets annoyed with the Teletubbies' antics or get too excited and, therefore, can vacuum their food or favorite things. The Teletubbies shout 'Naughty Noo Noo' and chase him around the House. The chase usually ends with a Big Hug. Noo-Noo has a removable brush on top of him, it's very rare that his brush is removed, it can be seen removed in the episode "Swans" and the video Big Hug.
- In the new series, Noo-Noo is no longer blue. He is now orange, pink and gold. The reason behind it was because the show was using Blue Screen; therefore, only some parts of him would be shown. Other than the color change, Noo-Noo's appearance remains the same.
- In the new series, Noo-Noo isn't as naughty as he was in the original series. In fact, the only episode where he is naughty is Packing
- In the new series episode Fixing Things, Noo-Noo goes outside for the first time.
- According to some rare concept art pictures, Noo-Noo was originally going to look like a space robot with tread wheels and a trunk. (See pic below)