Rocking Ryan (or King Kim) is a man who very much resembles Elvis in his appearance. He started a band with Serious Sam back in high school, but they eventually broke up. While Sam continued a musical career, Ryan ran around as Elvis in Florida's malls.
He is an Elvis look-alike. After they split up, Sam and Ryan reunited many years later during an after-party when Sam received an Emmy for being the best new artist. After a bit of joyous tears from both of them, the two joined up again and started up another band, which continued until Sam joined the Space Corps.