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He is an important asset for Erica, to find out if the V's experimented on her when she was pregnant due to her story of how she had abnormally high levels of phosphorous, the large amount commonly and mainly found on the V homeworld. He analyzed Tyler Evans DNA to discover that there are huge chunks missing, as if waiting for an input. ("Serpent's Tooth")
In investigating the DNA of both Alpha and Sarita Malik, Sidney discovers that the Visitors have evolved more quickly that normally possible, with Sarita Malik's DNA much more complex than Alpha's. This leads him to conclude that the Visitors are using genetic engineering to advance their species. ("Laid Bare")
he then helped the rest of the team figure out the concord structures were landing pads he then disguise himself as a construction worker for a concordia structure and was helped to get into the blue energy by evan and fifth columnist guard and when he saw Ryan Nichols after sabotaging the blue energy reactor he attempted to do something bad but was stopped he then showed the team that the 538 visitor ships were already here ("Devil in a Blue Dress")