I think this next one and the last one are both in Dr Who films cause
I found a third film i was wondering about as a Dr Who episode.
Anyway. I think its one where aliens attack the earth but they look
like humans except they are really lizards and at one point in the
film a guy rips open his chest and reveals that he is a lizard, I
don't remember if he knew he was or if he was turned into one...

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Request for Question Clarification by juggler-ga on 24 Aug 2004 20:57 PDT

Hi Strikeforce,

Could you be thinking of the miniseries "V" (1983)?

"A bunch of aliens come to earth trying to make nice with the human
populous... In reality they're a bunch of lizards in human clothing
who have come to Earth to use it's natural resources because their
planet is dying. This triggers a war between them and us."
http://www.hillcity-comics.com/movie_reviews/movie0310.htm

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Clarification of Question by strikeforce-ga on 25 Aug 2004 02:20 PDT

I think so cause I also remember them flying above the earth and they
look down on it through a hole in the bottom of their ship I think...

Okay, then we'll make "V" the official answer.

The lower photo on this web page shows a ship with a sort of hole in the bottom: 
http://thevisitors.info/episodes/v1.html
That's from a web site devoted to "V":
http://thevisitors.info/intro.html

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search strategy:
I remembered seeing the miniseries myself, so I searched:
 "miniseries v" lizards

Thanks!

Another one down 1 more to go