Grant and Jonah recover an injured seal and discover a mysterious implant in it's brain. When an intelligence agent decides the seal must be killed, the Aquarium staff race to save the creature's life before it's too late.
| Name | Type | Role | |
|---|---|---|---|
| Marc Strange | Writer | ||
| Claudia Theriault | Guest Star | ||
| Jean Causey | Guest Star | ||
| Gene Heck | Guest Star | ||
| Donna Yamamoto | Guest Star | ||
| Richard Anderson | Guest Star | ||
| Ken Girotti | Director |