The Grim Adventures of the Kids Next Door Crossover special (2007) While Billy's dad is underwear shopping, Billy wears his dad's lucky pants, and accidentally rips them with Grim's scythe. Billy opens the door to his house expecting the Powerpuff Girls but it turns out to be the Sector V operatives. Numbuh 1 disguises as Billy while Billy is taken back to the Deep Sea Lab. Mandy arrives at Billy's house and knows Numbuh 1 is not Billy, and tortures him into revealing the truth. Meanwhile, the Delightful Children from Down the Lane and Billy accidentally fuse with the scythe's power to create the Delightful Reaper. Mandy takes over the KND by fooling Numbuh 362 and the rest of the KND, but Numbuh 5 knows she is not Numbuh 1, but is taken to the med lab. The Delightful Reaper assimilates nearly all of Endsville (including Numbuh 2) and grows more powerful. Numbuh 1 and Grim try to get the KND to see the truth, but are imprisoned...

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