There are some denominations of Christianity today that claim to have a direct, special apostolic line running back to the first twelve apostles that gives their church group a unique legitimacy that other churches lack. These churches think that their baptism has special authority over the baptism of other denominations because of this supposed apostolic line.
However, these claims of unique apostolic blessing on the catechumens of these individual denominations are false. Being baptized (submersed) by someone from a special “apostolic” line does not make you any more holy of a Christian than being baptized by any other Christian. Your baptism is valid, no matter who baptized you, as long as you believed in the gospel and repented of your sins. It is Jesus Christ whom you believe in, not the human who submersed you in the water, that gives legitimacy to the ritual of baptism.
But because humans are proud and arrogant creatures, we often think that we have some special gift if we are baptized by a particular person or denomination. The Apostle Paul himself rebukes those who have this self-righteous better-than-thou attitude. For this reason He is glad that he did not baptize many of the members of the Corinthian church, afraid that they would brag about who baptized them, rather than trust in the One in Whose name they had been baptized (Jesus Christ).
I thank God that I did not baptize any of you except Crispus and Gaius, 15 so no one can say that you were baptized in my name. 16 (Yes, I also baptized the household of Stephanas; beyond that, I don’t remember if I baptized anyone else.) (I Corinthians 1:15-16 NIV)