We first see Chris at the end of season five he is a Whitelighter
from the future who claims he has come to help the charmed ones kill
the Titans who rule his time, when Chris first arrives it's very difficult
and through most of season 6 to know wether he is good or bad, he sends
The Charmed Ones after all the demons he can. And we see him do something
to Leo at the end of season five so who is he? He does a lot of things through
season six and it's not clear whether he can be trusted but we eventually become
to learn who he is. Chris is the second son of Piper and Leo he has come from
the future to stop Wyatt turning evil but the Wyatt in this time doesn't trust him
and puts his Forcefield up around him everytime he goes near him. Chris dies in this
time at the end of series six at the hands of Gideon.
We later see him at the end of season eight and his brother Wyatt in
the Manor with Piper and Leo.