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Appearances
Primus
Main cast, played by Eva Renzi
- Episode 1x01: Deepest of the Deep (Sep 22, 1971)
- Episode 1x02: Trial and Terror (Sep 29, 1971)
- Episode 1x03: Kiss of Life (Oct 6, 1971)
- Episode 1x04: Underwater Getaway (Oct 20, 1971)
- Episode 1x05: The Phantom Horse (Oct 27, 1971)
- Episode 1x06: Bearer of Light (Nov 3, 1971)
- Episode 1x07: Oil Rig (Nov 10, 1971)
- Episode 1x08: Pipeline to Danger (Nov 17, 1971)
- Episode 1x09: Breaking Point (Nov 24, 1974)
- Episode 1x10: The 65th Minute (Dec 1, 1971)
- Episode 1x11: Blade of Fire (Dec 8, 1971)
- Episode 1x12: Tektite #1 (Dec 15, 1971)
- Episode 1x13: 49 Sharks (Dec 22, 1971)
- Episode 1x14: The Sea is Boiling Hot (Dec 29, 1971)
- Episode 1x15: Death Tide (Jan 5, 1972)
- Episode 1x16: Sea Serpent (Jan 12, 1972)
- Episode 1x17: The Sniper (Jan 19, 1972)
- Episode 1x18: The Steel Fish (Apr 21, 1972)
- Episode 1x19: Black Diamonds (Apr 28, 1972)
- Episode 1x20: Infrared (May 5, 1972)
- Episode 1x21: Nuclear Black Market (May 12, 1972)
- Episode 1x22: The Black Hole (May 19, 1972)
- Episode 1x23: Trapped, Part One (May 26, 1972)
- Episode 1x24: Trapped, Part Two (Jun 2, 1972)
- Episode 1x25: The Net (Jun 9, 1972)
- Episode 1x26: Ten Minutes of Eternity (Jun 16, 1972)