The Really Really Incredibly Destructive Machine is, as its name quite bluntly indicates, the most powerful machine owned by Father and used by the Delightful Children From Down The Lane (with permission, of course).
It has long metallic legs, giant metal tentacles, and numerous weapons and gadgets attached, including flaming chainsaws for hands.
The Really Really Incredibly Destructive Machine was introduced in Operation: G.R.O.W.U.P., where the DCFDTL used it to successfully destroy the Sector V Treehouse. They needed to ask Father for permission before using it. It appeared in several other episodes, including Operation: F.O.U.N.T.A.I.N., Operation: L.O.V.E. Operation: I.T. and Operation: H.A.M.S.T.E.R. (while under the control of the Sinister Felines From Atop the Litterbox). Its appearance and abilities vary slightly between appearances. The DCFDTL uses the machine only to find that the falling pillars damaging it in Operation: F.O.U.N.T.A.I.N..
- The original model from Operation: G.R.O.W.U.P., Operation: I.T., and Operation: H.A.M.S.T.E.R. is the only one that is not destroyed throughout the series.
- The different model from Operation: F.O.U.N.T.A.I.N. was destroyed by falling pillars.