Since Legion was destroyed, the machines have been working to restore Skynet. Now the resistance has discovered their plans and must find a way to prevent them.

The Machines have been working in a way to restore Skynet back on, since Legion was destroyed, now the resistance discovered their plans and must find a way to prevent that from happening, and for that they must go underground to Gideon the new home-base of the machines.—Constantino Filmes