▁before ▁the ▁demonstr ation . ▁He ▁l aments ▁being ▁too ▁busy ▁to ▁date ▁before ▁the ▁tri o ▁take ▁leave . ▁Vel ma , ▁Sh ag gy , ▁and ▁S co oby ▁encounter ▁a ▁large ▁mechanical ▁dog ▁on ▁their ▁way ▁to ▁Dr . ▁Dev on ▁Al br ight ' s ▁office . ▁They ▁find ▁out ▁Dr . ▁Al br ight ▁was ▁the ▁original ▁cre ator ▁of ▁the ▁Me cha ▁M utt ▁technology ▁and ▁she ' s ▁bitter ▁that ▁the ▁more ▁famous ▁Dr . ▁St ap les ▁was ▁put ▁onto ▁her ▁project ▁to ▁raise ▁more ▁funds . ▁ ▁Sh ag gy ▁and ▁S co oby ▁go ▁off ▁and ▁find ▁vac u um ▁se aled ▁space ▁food ▁in ▁a ▁different ▁room ▁ ‒ ▁as ▁well ▁as ▁Me cha ▁M utt . ▁They ▁are ▁ch ased ▁into ▁a ▁large ▁wind ▁tunnel ▁room ▁and ▁get ▁tra pped ▁inside ▁before ▁the ▁industrial ▁fan ▁blow s ▁them ▁all ▁up . ▁Vel ma , ▁Fred , ▁and ▁D aph ne ▁find ▁them ▁and ▁turn ▁off ▁the ▁fan ▁but ▁not ▁before ▁Me cha ▁M utt ▁esc apes . ▁Mel anie ▁soon ▁joins ▁them ▁and ▁Vel ma ▁disco vers ▁the ▁controls ▁to ▁the ▁wind ▁tunnel ▁are ▁stick y . ▁When ▁they ▁confront ▁Ir v , ▁he ▁den ies ▁leaving ▁the ▁room ▁and ▁security ▁foot age ▁back s ▁up ▁his ▁claim . ▁Vel ma ▁and ▁the ▁others ▁ask ▁Dr ▁Al br ight ▁to ▁l end ▁them ▁her ▁prototype ▁dog ▁ro ver ▁to ▁find ▁Me cha ▁M utt ▁and ▁S co oby ▁and ▁Sh ag