Bettys fourth apperance. (1931) Betty Boop stars as Dangerous Nan Mcgrew the Sharpshooting Singer. Helen Kane original Boop oop a doop girl had previously played Dangerous Nan Mcgrew in a (1930) paramount movie. Bettys voice is provided by either Mae Questel or Kate Wright, meaning unknown due to the fact that it isnt the usual Helen Kane impersonation.