Sneezy Does It

S2, E10: On a routine mission to collect rock samples from Mars, the cadets cause an uproar when Hawk brings back a stone that contains living bacteria. Coot is overjoyed: the kids have discovered life on Mars!! As a reward, they're given the honor of being first to study the new life form in Coot's laboratory. But the more they analyze it, the more Robyn is puzzled. This bacteria looks so familiar... what is it?? They soon determine that the rock was contaminated by a sneeze from Hawk, who has a cold. Meanwhile, Coot has excitedly been telling everyone about the discovery! When the truth comes out, they're all crestfallen - until Coot explains that proving a theory wrong is often just as important as proving it right.