Limitless - 'The Legend of Marcos Ramos'

Fun with shredders.

A former FBI agent and Rebecca's mentor is shot dead in broad daylight and suspicion falls on Mexican drug lord Marcos Ramos (whose backstory is revealed in one of Brian's fantasy sequences including cheap eighties film filters and a swimming pool full of piranhas.) As the team works to track down Ramos and his favoured shooter, Brian runs into an old flame and seeks to rekindle the relationship, but wonders whether it is Brian or Brian-on-NZT that she likes.

'The Legend of Marcos Ramos' also reveals the darker side of Brian's deal with Eddie Morra, in the form of Mr Sands (Colin Salmon), a frankly sinister figure who explains that Brian does not work for the FBI; he was placed with the FBI to work for Eddie Morra, and by extension for Mr Sands. Should he refuse, his stabilising treatments will be cut off, and his father or anyone he loves could suffer. Morra might be a slightly shady benefactor, but Sands is clearly very bad people when he needs to be. Ultimately, despite great progress and Rebecca's advice that Brian and Brian-on-NZT are the same guy, and any girl who distinguished isn't worth his time, Brian breaks up with his ex to keep her away from Sands.

Sands and all that he represents bring a little darkness into an otherwise fluffy scenario, and I think that's a good thing. I don't want the show to get all brooding, since its strengths are its lightness, charm and the goofy fantasy sequences that Brian invents for the parts of an investigation he isn't allowed to participate in, but a little shade is important.