Mordred is found to be the only baby alive, and is taken in by his fisherfather, where he is raised and loved by his fishermother, who could not carry her own children.
I can't do it
Nyneve arrives to take Mordred to Lothian, where he will learn and be molded into the person he turns out to be.
Nyneve used magic in front of Mordred, which sparks his interest and later leads to him performing magic of his own
Mordred finally meets his father, Arthur and realizes he's a good man. Both men know its their fate to kill each other, but neither can bring themselves to do so, putting them in a standoff. Mordred makes attempts to find ways to alter his fate, but everyone tells him it cannot be changed, no matter how bad it is.
Mordred decided the only way to avoid his fate, is by staying away from his father. merlin later shows him a vision of whats to come, Mordred now accepts his fate and sets out to kill Arthur, and when he kills the king, it brings him only shame.
After the last battle Arthur awakes in some sort of heaven, Avalon, with Mordred i the form of a bird guarding him.