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"CO2 Sensor + Tree Branch"

“CO2 Sensor + Tree Branch” – While Mac participates in a challenge for government operatives to create robotic combat machines, Mac must help his biggest competitor, Allie (Ashley Tisdale), when her vehicle is hacked and heads to the Pentagon. Also, Jack attends his high school reunion, hoping for a showdown with his old rival who beat him out for homecoming king, on MACGYVER, on the CBS Television Network. Ashley Tisdale guest stars as Allie, a CIA operative, Mac’s former fling and his biggest competitor in the Challenge.