Tessa Greene is a girl in the 7th Massachusetts Militia Regiment. Along with her father, Mr. Greene, she was willingly complicit in Terry Clayton's plan to gather as many children as possible for the Skitters. She was attracted to Hal, and attempted to negotiate with her dad for his safety. While Hal and the others of the 2nd Mass were trying to escape, Tessa caught them and alerted the men of the 7th Mass. When Weaver was informed of the 7th Mass' collusion with the Skitters, he said the 7th would be left to fend for themselves.