It's wonderful!
Since you can't replace the monsters' voices, perhaps give them occasional subtitles? The dino thing and the mantis thing could complain it's too early in the morning for this crap. They look cranky anyway.
*Cat thing attacks handler*
"Neuter me, will you!"
*Mantis thing get zapped in the butt*
"Hey! Watch the abdomen!"
*Mantis thing tries to kill tied up Obi Wan*
"Hold still! This will only hurt a lot."