The Cathiolic version of The Lord's Prayer ends with "but deliver us from evil. Amen"
But the Protestant version has added on to the Lord's Prayer "For Thine is the Kingdom, the power and the Glory, forever and ever. Amen" Who added that last line to the original Lord's Prayer?

I will assume this was suppose to be in a religion forum, unless someone was putting this in the testing forum on purpose.

It is from the bible, no one "added it" one version is from Matt 6: 9-13
The other from Luke 11:2-4.

Both have been used throughout the years

CATHOLIC ENCYCLOPEDIA: Lord's Prayer (http://www.newadvent.org/cathen/09356a.htm)