Classic program for anyone that is looking for this, next cheapest is Play.com at £14.96. Quidco/TCB (4%) making the cost £10.26.
While working in his basement, Quinn Mallory opens the gateway to parallel worlds. For a test run, Quinn invites co-worker Wade Welles and his teacher, Professor Arturo, along. Upon opening the vortex, Quinn uses too much power, which causes the vortex to suck them in along with Rembrandt 'Crying Man' Brown, who happened to be driving by Quinn's house. The four are stuck in a parallel world and must find their way back to the gateway for the next 'slide', hoping each time that the next one will take them home.