As different aquatic microorganisms engage in casual conversations, we get a glimpse of the ideas and aspirations that float around at the bottom of the food chain.
| Actor | Role |
|---|---|
 Will HislopAdrian (voice) | Adrian (voice) |
 David ElmsOscar (voice) | Oscar (voice) |
 Barney FishwickPaul (voice) | Paul (voice) |
| GGustaf Georg LindströmAnton (voice) | Anton (voice) |
| DDavid O'NeillRick (voice) | Rick (voice) |
 Ellie WhiteLois (voice) | Lois (voice) |
 Baker TerryRobert (voice) | Robert (voice) |