Made in M.S. Paint
Well, considering I can't do anything in Source Filmmaker, I tried my best to use a combination of Source SDK, Garry's Mod and M.S. Paint to make...THIS!
Story (optional): One day, Twilight and (some) of her friends wanted to play Mann vs. Machine. Twilight had spent the last night brushing up on strategies and the robots they had to fight. She stayed on the Team Fortress website until she knew everything she had to know. And she knew everything! Everything except for the Giant robots.
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Models by Kassgrein [link]