Earl Hammond (June 17, 1921 - May 1, 2002) was an actor and voice actor. He is best remembered by 80s fans for providing the voices of Mumm-Ra, Jaga, and other characters on the children's TV series "ThunderCats". He also voiced the "Transformers" villain Megatron in a series of children's read-along books and performed the role of Buck Rogers in the 50s ABC television series. Wikipedia
The definitive Wikipedia entry for Earl Hammond. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Earl_Hammond