Bas Pellico was the pilot of the Lorelei. (AUDIO: Robophobia) On Kaldor, he was part of a group of friends that included Kit Laver and Liv Chenka. (AUDIO: Escape from Kaldor)
Whilst aboard the Lorelei, Bas found the Seventh Doctor snooping around and was suspicious of him, finding him to be a strange man. He was concerned when the Doctor reactivated some Sandminer robots and was later murdered by Farel. (AUDIO: Robophobia)
When Kit asked Liv about Bas, Liv told him that they had gone their separate ways after the Lorelei. (AUDIO: Escape from Kaldor)