Spin City

Piper is kidnapped and cocooned by the Spider Demon, a creature that emerges every hundred years to feed off a powerful magical being. During the attack, Chris is infected with the Demon's venom, causing him to mutate into a spider. In need of desperate help, Paige calls Leo. Phoebe then reveals to Leo that Chris is his son. While trying to save him, Chris attacks Leo and starts repeatedly punching Leo, yelling that Leo doesn't know him. Later, Leo finds Chris on the Golden Gate bridge and begs him to tell him why he hates him so much. Chris replies that Leo was never there for him, but he was there for Piper, Wyatt and half the world. Leo tells him that maybe he didn't come back to save Wyatt, but to save their relationship as well. With tears in his eyes, Chris angrily says "I doubt it" and orbs away.