Other source:
The two "Namekians" reveal that they have been stuck on this planet since their ship broke down, and they have been planning to steal Bulma's ship. They read their minds after her ship crashed, and so they projected images of Namekians over their true forms. Gohan, Bulma, and Krillin, however, are able to escape the clutches of the two aliens, and continue their trip to Namek. After a long journey, Gohan and the others celebrate their arrival on Namek, but their party is cut short by the arrival of Vegeta. However, he's not even their worst problem, because Frieza is also on Namek.
