It's a dark night and Glitch is flying his Grim HQ over the sea around the Isles of Scilly. He's in the middle of reading a bedtime story to his Grimbots when his lamp breaks! He needs a new light, and when he sees the Bishops Rock Lighthouse in the distance he demands that the Grimbots get him the bulb. Meanwhile, Xuli, Foz and Lars are flying the Vroomster nearby, and Lars realises that the bulb is missing from the lighthouse. Glitch and the Grimbots have taken it and turned it on inside Grim HQ. But the new light is so bright that Glitch can't see anything, and Grim HQ goes out of control!