Merlin tells Arthur his son will one day grow to kill him. so to preserve his rule he must kill his son. Arthur proceeds to put every child born on May 1 into a boat that's set for sea. Arthur recognizes his son as he places him in the boat.
Don't mind me, I'm just playing baby tetris
The Sorceress Nyneve comes to take Mordred away to Camelot tomeet king Arthur, This would go on to form somewhat of a maternal bond between Mordred and Nyneve.
Come with Me Mordred.
That name sounds familiar but my name is Tad.
Mordred finds out the truth about his real parents. Garet calls him closebred after Mordred beat him up for kicking his dog. Mordred is the result of a relationship between King Arthur and his sister.
Mordred stumbles upon three women holding a string in the forest. They say the string is his fate and that he can cut it to stop himself from killing his father. However Morgan later says that no mater where he had cut the string he was always meant to cut it there. Meaning that you can not escape or alter your fate.
Mordred watches as Garet and Gawain kill Morgause, his mother. This is what basically makes him give up on fighting his fate
Mordred and His father Arthur do battle and Mordred and does die and does kill Arthur as Merlin had predicted.