Tam is one of the Genoshan Magistrates. Her further origins are, as of yet, unknown.
Tam was created to be Havok's girlfriend in Genosha by Jim Lee and Chris Claremont. Plans for this, however, never materialized.
Major Story Arcs
Tam was one of the Genoshan Magistrates that led the attack on Xavier's to start the X-Tinction Agenda. At one point, Tam is injured and her suit is used by Psylocke to gain access to the citadel. When the report comes in that Tam has been injured, Havok relates that he is romantically linked to her, which makes his attack on Psylocke all the more fierce. Tam soon recovers, only to be swept off her feet by a kiss from Gambit, a move that buys him time to attempt an escape.
Tam should be confused with Chief Magistrate Tam Anderson, the Chief of Genoshan Magistrates whom first appeared in Uncanny X-Men #236.