My very first memory of Doctor Who is the Doctor and Sarah driving under a dinosaur!

I know I've seen Invasion of the Dinosaurs since, but I recall little about it and what I do seems rather confused with Robot in my mind which I have watched fairly recently. This is a rather different sort of story to Invasion, in particular it's not trying to be about anything other than an over-the-top mash-up of ideas. Bad dinosaurs would have been totally fatal to it in a way they probably weren't to Invasion, even though they may have dragged it down.