At the beginning of Scorpion: Revenge a group of masked people enter a safe manufacturing company with a bottle of water, guns and explosives. Shooting two people dead, they open a safe and set off exploding boxes. Walter O’Brien is still having trouble dealing with Paige’s ex husband Drew getting closer to their high IQ son Ralph, and in the process becoming involved with Paige again. Walter is having to work really hard to handle Drew’s encroachment and Team Scorpion get called in to investigate the safe manufacturing job. Before that, Drew asks Paige to dinner and the gang, especially Sylvester, are all uncomfortable that they eavesdropped on the conversation.