<Tr> <Td_colspan="7"> Heartland takes in a pregnant mare named Melody . Mallory gives Ty riding lessons . Ben competes in a horse show and refuses to talk to his aunt Lisa . Meanwhile, Jack and Ty go on a cattle round - up, and Tim is introduced as the trail boss . Jack and Tim fight each other that night, and Ty learns that Tim is Lou and Amy's father, and Jack's ex-son - in - law . Lisa shows up to talk to Ben, and Jack invites her to stay for pancakes . </Td> </Tr> <Tr> <Th> 8 </Th> <Td> 8 </Td> <Td> "Out of the Darkness" </Td> <Td> Dean Bennett </Td> <Td> Heather Conkie </Td> <Td> January 13, 2008 (2008 - 01 - 13) </Td> <Td> 108 </Td> </Tr> <Tr> <Td_colspan="7"> Amy tries to help a champion stallion and his depressed trainer, who were injured in a stable fire . In the process, she confronts her own unresolved feelings about her mother's accident . She is also able to clear the name of the trainer, who had been blamed for the stable fire and consequently lost his job . Meanwhile, Jack grows increasingly attracted to Lisa . She asks Jack to come look at a horse with her, and he agrees, but insists on driving his truck to the sale . Jack declares that it's not a date but it turns into one, especially as they share a picnic lunch when Jack's truck breaks down . Jack and Lisa enjoy themselves, until Dan Hartfield shows up at the sale and introduces himself as Lisa's husband . Jack leaves her behind, feeling foolish, until Lisa shows up later at Heartland, and explains that Dan is actually her ex-husband . </Td> </Tr> <Tr> <Th> 9 </Th> <Td> 9 </Td> <Td> "Ghost from the Past" </Td> <Td> Dean Bennett </Td> <Td> Leila Basen and David Preston </Td> <Td> January 20, 2008 (2008 - 01 - 20) </Td> <Td> 109 </Td> </Tr>

When do ty and amy get back together season 4