Captain worst cartoon ever [i]

I remember reading awhile back that Captain Planet had quite a list of guest stars and recurring characters. Check it.

Whoopi
Martin Sheen
Louis Gosset Junior
NPH
LeVar Burton
Danny Glover
Vanna White
Sting
Casey Kasem
Helen Hunt
Dean Stockwell
Meg Ryan
James Coburn
Jeff Goldblum

Community service for that coke conviction? Hollywood activism? High-profile group sadism against children?