The tiny, motorized, three-clawed service droids were actual working models, save the episode "The End" (S1,E1), where the skutters were a post-production addition to the chicken soup nozzle scene. They were made up of various parts including old shoe boxes and the engines of radio controlled cars. Interference originating from the radios of a nearby taxicab company, which was particularly busy during filming of the episode "Future Echoes" (S1,E2), caused havoc with the skutter models on set. One reportedly poked Craig Charles in the eye, and another launched an attack on Chris Barrie's groin. Coincidentally, the skutters had been scripted as very inept towards their maintenance work and mischievous towards humans.