The Gex series first game was Gex released on 30th November 1993.
1993
Gex
30th November 1993
1995
1st December 1995
13th December 1995
1998
Gex: Enter the Gecko
31st January 1998
1st August 1998
1st December 1998
1999
Gex 3: Deep Cover Gecko
1st March 1999
31st August 1999