Detailed Voice Cast?

I'm desperately seeking a detailed voice cast for this show (as in which "additional voices" played which characters in which episode), but I can't seem to find anything on the web. :( Anyone know where I might find something like that?

I'm specifically trying to find out which characters Venus Terzo and Shane Meier might have played. I've checked the three episodes that they're listed under without the "credit only" brackets here on IMDb, but can't hear either of them! It's driving me crazy! Any help will be much appreciated. :)

Thanks in advance. xxx