Loch Ness Monster (Scooby-Doo! and the Loch Ness Monster)

The Loch Ness Monster that was terrorizing Blake Castle was actually three different vehicles, operated by Fiona Penbrooke and her accomplices Angus and Colin Haggart.

Water-going version
The water-going version was a disguised submarine attached to the bottom of Penbrooke's research boat. She could get into it from a hatch in her boat and pilot it around the Loch.

First land-going version
There was additional evidence of the reality of the Loch Ness Monster: the damage it did around the Blake Castle and the footprints it left. (That damage was done by a land-going robot operated by the Haggart bros., hired by Prof. Fiona Penbrooke).

Second land-going version
Later, Penbrooke hired the same two brothers to steal Chillman's van and disguise it as a second land-going version of the Loch Ness Monster.

All of this was done to convince Sir Ian Locksley that Nessie was real so he would take her photos seriously. (The brothers did it more as a prank than for the money.)

Appearances

 * Scooby-Doo! And The Loch Ness Monster