The Borgified Corpse wrote:
Before he was Captain Hollister on Red Dwarf, Mac Macdonald had a bit role as a colony administrator on LV-426 in Aliens. Ironically, his role was cut from the theatrical version and didn't resurface until the special edition came out in the early 1990s, after Red Dwarf premiered.
Mac MacDonald has had loads of similar roles - he's an American but he lives in the UK so whenever an American movie was produced in Britain, chances are there would be a part for him.
The Superman movies had a lot of American ex-pat actors too. MacDonald himself is in Superman IV.