The Ecco the Dolphin series first game was Ecco the Dolphin released on 29th December 1992.
1992
Ecco the Dolphin
29th December 1992
30th November 1992
1993
29th July 1993
1994
11th March 1994
Ecco: The Tides of Time
25th August 1994
1995
Ecco Jr.
15th August 1995
2000
Ecco the Dolphin: Defender of the Future
16th June 2000
2002
22nd February 2002
2006
28th November 2006
2007
26th June 2007
6th November 2007
2013
26th June 2013