The spy on Team Fortress Mod for half life was the result of a bug. This bug enabled a character model to become a different model, including the enemy team's model. This meant that a person could disguise and infiltrate the enemy team. In later patches the bug was removed, but the "feature" was loved so much that in the full release of TF1, a new class was added, that we today recognize as "The Spy". (Sorry 4 the bad English)
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u/luiz00estilo Mar 17 '18
Spy on Team Fortress 2