Guest Stars Liam O'Brien voices Professor Maelstrom Michael Hawley voices Zack Abby Trott voices Ivy Sharon Muthu voices Dr. Bellum Bernardo de Paula voices Jean Paul (Le Chevre) Andrew Pifko voices Antonio (El Topo) Michael Goldsmith voices Gray Andrew Pifko voices Miro Bernardo de Paula voices Computer Sharon Muthu voices Dr. Jeanine Dennam