There's a rumor that if you finish a second game of ME3 or import a ME2 save file you get an extra secret ending. I've also heard that this is just:
The epilogue with the child and the old man, or the Shepard lives ending if you pick destroy with greater than 4000.
Anyone know for sure?
Best Answer
There isn't any secret ending, there is only a "perfect" ending which gives you hope that Shepard survived, that's it. But as mentioned by Vasil, you need to destroy all synthetic life and get AT LEAST 4.000 Effective military strength and "save" Anderson by either having high enough paragon or renegade or by shooting the Illusive man. This is the only "secret" ending I know of.