The crimson-ringed octopus has venom so toxic that one drop can immobilise 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.