<Li> Jennifer Hudson as Young Nana </Li> <Li> Garth Jennings as Miss Crawly, an elderly iguana with a glass eye who is Buster's administrative assistant . </Li> <Li> Peter Serafinowicz as Big Daddy, a gorilla gang leader who wants his son Johnny to follow in his crime business . </Li> <Li> Nick Kroll as Gunter, a passionate dancing pig who is partnered with Rosita for the show . </Li>

Who plays the voice of johnny's dad in sing