It's the third episode of half-an-hour of T.U.F.F. Puppy, after T.U.F.F. Choices/ Sob Story and before Happy Howl-O-Ween.
Keswick shows Dudley, Kitty and the chief a secret room hidden in the elevator, where they placed their best and newest inventions, including a time machine capable of seeing through a screen time events happened, but still has not been proved. Dudley decide to try putting on a plate his new BonePhone 5S at a time in the past (such as ... August 20, 1977), was positive, but they were spied on by D.O.O.M., so decides to go there. Meanwhile, Dudley plays with the time machine, he saw the future, but by mistake was a wedding between him and another person, who happened to be Kitty, Dudley gets scared, causing an accident put him in an almost irreparable forming a portal that leads to the past, seeing the gravity of the situation, Kitty, Keswick and the chief over there and they are absorbed by the portal leverages what happened and enters the portal, which was about to close.
T.U.F.F. agents were finally taken by the portal to the 90's, in months to culminate, where they meet Dudley, Kitty and Keswick as kids, and the chief to being leader of TUFF, when Snaptrap enter meets his father, Verminious Snaptrap Senior (for the moment, the leader of DOOM) and himself (Snaptrap) as a teen, they have a plan to put Dudley and Kitty to jail and ruin the future.