An opening in time and space in which the Pastmaster (or anyone else with the misfortune of being pulled in) travels through time. Also referred to as a portal by the Pastmaster.  It is a circular opening in the sky with clouds spinning around and can be seen for several miles.  The ability to open such a time vortex comes from the Pastmaster’s Watch, though Queen Callista was capable of opening one to send the SWAT Kats home from the Dark Ages.