Stargate

The Stargate is central to the premise of the Stargate movie and its two spin-off series (Stargate SG-1 and Stargate Atlantis). The stargates are a series of devices that can create wormholes between distant worlds. Generally, the stargates have dialing devices (forgot the name - could someone please fill in the name and initialism?) that can be used similarly to a telephone dial to select the place where the connection should go.

The stargate found on Earth in the initial movie was missing its dialing device.

When a stargate opens, a dangerous amount of force comes out. So, standing too close to an opening stargate is deadly.

Stargates stay open for a limited period of time.

Number of characters on the stargate?