Applesauce was a powerful computer program, created by Whit, Tasha Forbes, and several other unknown people, made by the Universal Press Foundation for 'members of our government' including the Department of Defense. Both Regis Blackgaard and The Whisperer wanted it very badly.
However, it is very clear that Applesauce was much more powerful than electrical sabotage; it has been described as powerful enough to take over the world. No one knows exactly what it does. For example, in #291: A Name, Not a Number, Part 2, Tasha says that she developed the molecular compound TA-418 with help from Applesauce.
To access the secret computer room to use Applesauce in #073: A Bite of Applesauce, a key is hidden in a copy of C.S. Lewis's "The Last Battle," the last book in The Chronicles of Narnia series. "The Last Battle" is an apocalyptic story about the end of the world, but in a Christian context, so for the key to be hidden there hints ominously about the power of the Applesauce program, that it may have something to do with the end of the world.
Whit erased Applesauce in #84: “The Battle, Part 2”, and as far as anyone knows there is no existing copy.
Interestingly enough, Dr. Blackgaard's five attempts to cause havoc throughout AIO seem to all be connected to Applesauce: trying to steal it, stealing a government computer (which VERY well could have had Applesauce on it), trying to steal TA-418 (which Applesauce was used to make), taking over Whit's End (under which is found a mineral used to catalyze TA-418), and taking over the Imagination Station (which could have had Applesauce on it at the time, see below).
In #635: “Accidental Dilemma, Part 2”, Jason claimed to have Applesauce on a laptop, but most likely this was only a trick to lure the bad guy. Even if there was a copy of Applesauce on it, the computer exploded-or was thought to have exploded, but it was actually caught in an explosion.
There could have been a copy of Applesauce on the Imagination Station in #499: “Exit”, and running it still performed a systems check, overloading the machine and causing a meltdown. Or 'Applesauce' could have been just a command to simply self-destruct the Station, showing Whit's eccentric sense of humor.
- #73: “A Bite of Applesauce”
- #83: “The Battle, Part 1”
- #84: “The Battle, Part 2”
- #291: “A Name, Not a Number, Part 2”
- #499: “Exit”
- #634: “Accidental Dilemma, Part 1”
- #635: “Accidental Dilemma, Part 2”