The Diffy's catch a futuristic disease called greenemia which causes them to turn green and act completely opposite to how they usually act.

Phil and Pim have been fighting all week. Lloyd and Barbara couldn't take it any longer so he called for a Versa Day. For one school day Phil and Pim have to switch lives. Meanwhile Lloyd wants to get Curtis a job....if only he could find a place that will hire him.

Phil and Keely have a huge test in Mr. Messerschmitt's class, but take advantage of The Giggle. Phil and Keely, then, both fail the test. So Phil tries to make it up to Keely. Meanwhile, Pim goes to an R-rated movie and brings curtis as her parent.

Phil is forced to cancel his school dance date with Keely; Pim uses the Wizard to create a date for the dance.

Keely tries to get together two people and it backfires on Phil. Pim becomes a "psychic" and fools Mr. Hackett.

After forgetting Keely's birthday last year, Phil is determined to make this the best birthday - or Nirday as it's called in the future - ever.

Phil and Keely are on a virtu-date and the robot waiter starts flirting with Keely and Phil is jealous.

Mr. Messerschmitt insists his students take the Career Placement Test. However, Phil doesn't know what he wants to do and doesn't want to be trapped in a job for which is not suited.

Phil and Keely offer to babysit Mr. Messerschmitt's nephew Nathan, and get more than they bargained for with the trouble making 5-year-old. Phil uses the New Ager, and the boy ends up 80-years-old.

Pim abuses her power when she becomes principal for the day.

Mr. Hackett moves in next door and the Diffys invite him for dinner. Pim tries to sell the house.

When Tia moves away, Keely gets Phil into doing everything that she would normally do. So Phil hooks Keely up with the new girl.

Lloyd realizes that the high school's time capsule could return the Diffy's to the future.

Phil replaces Curtis as field trip chaperone when Mr. Hackett is too ill to escort their class to the museum. Phil locates a part from the time machine during a class trip to the museum.

Phil is fed up with trying to hide his secret about being from the future, and decides to tell the world. This results in he and his family becoming celebrities, but means he loses his special friendship with Keeley.

Phil loses the wizard and to his suprise he finds that Mr. Hackett has it. Now Phil is on a mission to get the wizard back. Will Mr. Hackett find out Phil is from the future?

Phil finds out that a kid from his school is actually his great-great-grandfather.

Phil solves a problem that math teacher Mr Hackett says is impossible - and Keeley blurts out his answer in class. She's moved to the advanced math class and Phil has to come to her rescue.

When Christmas Eve rolls around, Phil tells the story of when his family first came to Pickford and how he met Keely. Lloyd also decides to tell the story of how they got the house.

When no one watches Keely's investigative reports show Pim comes to the resuce by offering to help make her popular amongst her viewers again but Keely realizes that Pim is just abusing her to make money and goes back to making "real news" with Phil.

Phil and Keely finally become a couple. Though Lloyd has all of a sudden fixed the time machine, now it's time for the Diffys to head back home. It's Keely's worst nightmare when she realizes Phil is leaving for real.

Phil's sick of everyone invading his personal space and jumps at the chance of living in the garage. He loves it, until he has to start paying his own bills and finds out how hard it is.