So it follows the same story as MK3, but contains all the characters and most of the arenas from the previous parts. This is an improved version of Mortal Kombat 3, which contains everything that could be seen in previous parts of the trilogy, or in the game Ultimate Mortal Kombat.
There have been a large number of sequels, although the name Mortal Kombat Trilogy suggests that this is the third part, or a compilation of previous titles, this is not the case. Mortal Kombat is a very well-known term to everyone who played fighting games on old computers.