Many Foster's fans were upset when they heard Mac's new voice (Grey DeLisle), which sounds nothing like his original voice (Sean Marquette).
And Tara Strong's version of Cheese sounds like Timmy Turner after snorting crack.
Averted in the Updated Re-release: Most of the voice actors returned to their original roles.
Johnny Bravo is not voiced by Jeff Bennett. It's quite apparent as Johnny no longer sounds like Elvis Presley.
Aku is not voiced by Mako, since he is sadly not with us anymore. He is, however, instead voiced Fred Tatasciore rather than Greg Baldwin, who voiced the character in FusionFall, would go on to return to the role in Samurai Jack's fifth and final season, and in general, the go-to choice when one of Mako's characters needs to return.