The Lab Rats get their first mission to stop Davenport's hi-tech super fast train from speeding out of control. Leo sneaks along, but when the Lab Rats discover he accidently discarded the braking system they were supposed to install, they must improvise a way to stop the train before it crashes into a nearby town. Meanwhile, Tasha is given her big break at the TV news station when her boss asks her to cover the runaway train.

When Chase refuses to admit that Adam has good ideas, Adam decides to run against him for 'Student of the Semester.' Meanwhile, Leo takes advantage of Bree's bionic super speed making her his personal taxi.