Connection to Other Media
When using the Arc Thrower (a stun gun which uses an electrical pulse), upon success one of the random things possible to be said by the user is "1.21 gigawatts baby!". This is a reference to the Back to the Future movies, where the same amount of energy is required to operate the time machine.
When you build a new weapon type, you get to see a short cutscene of the engineers trying out the weapon in a firing range at your base. The targets they use for practice feature the sprites of aliens from the original XCOM game, released in 1994 for PC and various consoles.
The name of the trophy "You Have 5 Seconds to Comply", which you get for building a S.H.I.V (basically a robot soldier), is a reference to and quote from the first Robocop movie.
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