Scry Hard
Leo is a recurring character throughout season one and the beginning of season two, while he was busy being a whitelighter and Piper was debating between Dan or Leo, but when Piper choose him over Dan he became a supporting, but always present character. That is until season eight when they had to write Leo out of part of the season for budget reasons, bringing him back for the finale.
In the episode "Love Hurts" after he is shot by a darkliter while protecting an innocent woman from the darkliter. He had brought the woman to San Fran to get her to the sisters to protect and was found by darkliter and orbed into the attic with Piper scaring her to death as he was dying and she hadn't known what he was.
The last episode of season 3 ended with Prue and Piper being thrown through a wall and Doctor Griffiths through the window. Shax leaves and closes the doors. There was never an episode that started right after those events because Shannen was already fired. Season 4 started off with Piper trying to bring Prue back and throughout episode 4x01 and 4x02 it is explained what happened between 3x22 and 4x01. This is how it all went: "Leo orbed with Phoebe back to the Manor after battling demons in the Underworld, the left Cole behind. But Leo and Phoebe were to late by the time they arrived. Leo had only enough power left to heal Piper but it was too late for Prue."
The episode is the season 3 final and is called All hell breaks loose
He doesn't. After a premonition of the future, seeing her daughter and Pipers TWO sons, Phoebe puts two and two together, but is convinced by Chris not to tell anyone. In a later episode, she tells Paige anyway :P After that, something happens that forces them to tell Piper and Leo, more than that, I don't recall... Sorry... :S Anyone feel free to improve the answer! ;)
I do not know the name of the episode but I am pretty sure there is at least one episode were Leo tickles Piper.
i dont remember the name but its season 2 episode 4
Forever Charmed, the series finale
It is the episode 'Just Harried' and it should be on the 4th disc, second episode...
Piper finds out in 6x16 and Leo in 6x18
season 2 disc 1 or 2
On the episode "A Call To Arms" Piper receives extra arms making her have 8. In this episode Piper and Leo receive powers of Hindu Gods. This is the first episode of season 7.
He only tells Phoebe and Paige. Phoebe and Paige tell it to Piper. Leo finds out from Phoebe.
well in season 6 episode 6 they bang and therefore chris is concieved
In season 5 episode 4, the episode is called Siren Song
The very last episode of charmed of Season 8 Episode 22 "Forever Charmed" when Piper and Leo go back in to time to save Phoebe, Paige, and even Billie
Season 3 Episode 20 - Exit Strategy. Piper and Leo are trying to get his passport and while in line Piper gets frustrated and ends up blowing up the clock.