<Tr> <Td_colspan="8"> Phoebe, Paige, and Piper must stop warlocks who are enslaving the world's muses to use their divine creative inspiration for evil . In the midst of the assault, Cole becomes testy about Phoebe's rebuffing his marriage proposal and is concerned that without his demonic powers he can no longer protect the love of his life . </Td> </Tr> <Tr> <Th> 76 </Th> <Td> 10 </Td> <Td> "A Paige from the Past" </Td> <Td> James L. Conway </Td> <Td> Daniel Cerone </Td> <Td> January 17, 2002 (2002 - 01 - 17) </Td> <Td> 4301076 </Td> <Td> 3.4 </Td> </Tr> <Tr> <Td_colspan="8"> With Leo as her guide, Paige goes back in time to her teenage years, in an attempt to resolve her feelings about the accident that killed her parents . Meanwhile, Piper must prevent ghosts, who have inhabited Phoebe's and Cole's bodies, from fulfilling their mission . </Td> </Tr> <Tr> <Th> 77 </Th> <Td> 11 </Td> <Td> "Trial by Magic" </Td> <Td> Chip Scott Laughlin </Td> <Td> Michael Gleason </Td> <Td> January 24, 2002 (2002 - 01 - 24) </Td> <Td> 4301077 </Td> <Td> 4.1 </Td> </Tr>

What episode of charmed does phoebe find out about leo