Underwater

S2, E21: The crimson-ringed octopus has venom so toxic that one drop can immobilize an elephant; or one Mr. Woods and one Elizabeth. Mr. Woods, hit by a poisoned spitball from Garth, ends up stuffed into a cupboard and Elizabeth, accidentally stung, remains gracefully unconscious on her laboratory floor. Meanwhile, Ms. Hammer demands to know Mr. Woods whereabouts and Sacha and Verity have to create a diversion plus hide Mr. Woods and his mobile phone. Toby needs the octopus to manufacture an antidote, but Verity has let the octopus go and it's now hiding in a crevasse. A shrunken Garth nearly becomes fish food as he bullies the octopus into Russ's waiting net and Toby is eventually able to rescue Mr. Woods and Elizabeth.