Flim and Flams monster

Gilda, Trixie and Spike are turned a three headed monster. It's up to the greatest of heroes to fix this, Flim and Flam.

In an effort to give creatures the power of other creatures Flim and Flam make a machine that accidentally fuses Gilda, Trixie, and Spike into a giant three-headed monster that begins terrorizing Ponyville. It's up to them to fix it before anypony realizes it was they who caused it.