A: Not so much. From the person who has the Expendable Crewman, they’d first have to take the Expendable Crewman, clearly, but since they get ALL Beings, they don’t stop there — they take any other Beings that person has in play as well. So really, the Expendable Crewman can only protect you when a single card is being taken. It provides a buffer… but that buffer is only one card deep, as it were.

Note that in Star Trek Fluxx, Ensign Smith functions as the Expendable Crewman, while in TNG Fluxx, Tasha Yar has that special ability.