Overlabbing is the third part of the first episode in season 4 of Dexter's Laboratory, which first aired on November 22, 2002. In this episode, Dexter and Mandark merge their laboratories together, causing chaos.
Dexter and Mandark both build their labs into each other's labs and are forced to share.
Dexter and Mandark are going to extend their laboratory sizes to make room for more of their inventions but when they do, they both overlap their laboratories into each others without noticing. Once they figure out, they get into a fight which is too evenly matched and the two of them are now forced to share.
They both start working on plans. Mandark's plans are to destroy Dexter's Lab and Dexter's Plans are to keep Mandark from destroying his lab. They both start critisizing each other's plans and then they both remodel each other's sides of the laboratory and completely change it into their own ways. Then, Dexter and Mandark destroy each other's labs and cause a huge hole in the ground destroying the neighborhood above causing chaos everywhere and they both argue over who won.