Oh I know what it is...it took me a while to figure out a composition so I came up with a basic story to help me along.
The Gang and run into Adam and Jaimie testing a myths about old houses or maybe ghost hunting in general.
They decide to all check out the spooky house. (Typical for these guest star episodes)
Durring the course of the the show they run into Keri who's some how lost the boys (Grant, Tory and Keri always work separately form the Adam and Jamie). She of course, spend s the rest of the episode makeing eyes at Freddy (all the girls make eye at Freddy lol)
In the end they some how over lap with Grant's Ghost-bot suit (They couldn't get their myth to work so they were simulating the results they wanted) and get caught in Freddy's trap and unmasked.