They are on the Death Ball to visit Dark Laser's attractions, put there to help pay for the repairs of the Ball after Timmy's most recent destruction of it. They are seen going to the Death Mall and Death Ball Alien Zoo.
They look like stereotypical extraterrestrials, pointed ears and two small antennae sticking out from the tops of thier large, bald heads. They have skin coloured a light tint of either green, blue or purple. The tourists wear jumpsuits that are a darker shade of their skin colour and white gloves.
The aliens are the beings that attend to Dark Laser's zoo, the one he built to get the money to repair his Death Ball, and he caged the Turners and put them on an exhibit to attract more aliens. He said to them that if the money spent reached 100 billion (which is how much he needed to repair the Death Ball), he would send the Turners to space, but as it took a lot of time he decided to use the Turners to get the money faster, and put Timmy on a water show with Orcatron. They are not allowed to feed the Turners.