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When an explosion on a wharf puts a man in hospital, Frank and Helen investigate the disappearance of an environmental activist who they believe is responsible. While watching a tape of a triathlon, Gavin notices that a competitor, who did not complete the race, is pulled underwater during his swim.
From this episode to the final of season three, Steve Bisley is listed in the opening credits, rather than as a guest star (despite not appearing in this episode).
Frank: If we prove that those drums at the bottom of the harbour are yours, you'll be getting a call from Captain Planet!
Gavin: Where’s Frank?
Helen: Ah it's good to see you too, Gavin.
(Gavin is video recording a triathlon event)
Tommy: Gavin, Gavin, Gavin. Been demoted to making home movies?