Oldbot is an elderly robot aboard the space station R.U. Sirius. His original appearance was nearly identical to the robot from the TV series Lost in Space, but this was changed after he got an upgrade. Being a very old robot, Oldbot suffers from a poor memory and often has to go to Dr. Mel's office to fix some defective component or ask for new parts.
- Oldbot's first appearance in the strip was on February 20th, 2005. He got his upgrade on July 22nd of the same year.