The Tenth Doctor, Donna, Sam, and Al meet up during one of Sam's leaps that lands himself in 2002, three years beyond what Sam remembers as his present. The four of them are there to stop a confused "time jumper," but there are just a few problems.... For one thing, Sam is deaf and doesn't know sign language. Secondly, Al is stuck in the imaging chamber with them, and thirdly, the Doctor has no idea how the time jumping works. They have to stop the Jumper before he claims his next accidental victims: the students at Sam's private high school.