Bob steps into a mysterious portal and ends up in a new world. After spending some time in this world, another portal pops up and he steps through. Meanwhile at Lego city I go looking for Bob but can't find him anywhere. Eventually I spot a portal and jump in. Portal after portal, world after world and Bob still isn't home nor does he know who is causing them and for what purpose. Eventually we team up to try and solve the mystery of the portals.