1). NWO
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The most successful of all invasion angles was what WCW pulled off in the mid nineties with the NWO. Scott Hall had come to the end of his WWE contract and the former Razor Ramon showed up at a WCW show unannounced and gave a promo.
Hall was positioned as some one coming over from the WWE to destroy WCW and Kevin Nash aka Diesel followed suit the next week. The two would later give an interview saying that they were not working for the WWE in order to prevent WWE from successfully suing WCW.
With the addition of Hulk Hogan, the NWO was formed and a multi year angle was devised where the three were positioned as outsiders looking to take over WCW programming. Multiple wrestlers joined the stable and the angle was responsible for the spike in WCW's ratings as it dominated the WWE.
