Board Thread:General Discussion/@comment-4504826-20160419213859/@comment-29575510-20171007192228

Mettaton NEO fight. Also, the ending of the fight is Gaster intervening and killing both himself and you (MTT survives). The ending cutscene is Mettaton looking at what remained of Gaster and after the credits the same robot voice that says OOH YESS says WE CAN REBUILD HIM. CALL ALPHYS.