Teleportation

Teleportation
Teleportation is the ability with machines to teleport an object(s) or being(s) to point A to point B but in the Half Life series the teleportation can go normal to radical as seen in the series like causing an invasive alien armies to Earth.Teleportation is a recurring theme in the series (except in Episode 1).

Half Life and Expansions
In half life an accidental teleportation caused by the Resonance Cascade that teleported Gordon throughout Xen and then discover that the event cause many Xenian creatures to invade Black Mesa Facility.Then Gordon must go to Xen by the Lambda Core teleporter to kill the "mastermind" behind the invasion.In Blue Shift Barney must escape with other scientists by an old teleport but when he teleports through the teleport he first encounters Stanley but then teleports to other locations and sees Gordon being taken away by HECUs then teleports back to the scientists and then escapes Black Mesa with them. In Opposing      Forces