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Jacob is telling Elliot, Nick, and Alice about when teenage Colton shows up one day. They spend the day together and Colton tells him exactly what to harvest for the next couple years. We see Del who is contemplating why Colton kept this from her. 
Back in the 1800's, Kat and Thomas are talking and kissing some more. She's like what am I even doing here? Am I just trying to get back at Elliot? Thomas is like i dunno man. She is like I just gotta have some time. When she gets back to the present, she walks by Elliots how and she locks eyes with him...he knows she time traveled. 
Alice and Kat are talking and Alice talks about how she believes that Casey is her kid and it's messing with her. She walks outside as Noah is walking up and she breaks up with him. Kat is looking through the archives that Casey worked on and she notices that they signed their name as the letter K.C. 
Alice travels back and time to talk to Colton and he sings her a song that sounds a lot like a song about diving into the pond and time traveling.
Del is grappling with the fact that Colton knew about the pond and just watched her mourn the loss her child. 
Kat tells Elliot about the kiss and then promptly goes back the 1800's to kiss Thomas some more. He tells her that Susanna is in trouble because people are real mad at Cyrus right now. So she goes to rescue him. 
Alice is back in the 70s and she records a track with Colton. He then plays the song that he wrote for Del but didn't get to play for her and it makes Alice cry. 
Back in the 1800's, Kat catches up with with Susanna but then they're captured and brought to Cyrus. Cyrus found the painting and knows that Susanna has been protecting Kat in 1814. He's mad and he's going to take the angry mob to the Landry farm to burn it down. 
Alice gets back to the pond and finds Evelyn face first in the pond. Alice freaks out on her and tells her her poems womp. 
Back in the 1800's, Susanna and Kat try to warn them to leave but they won't. The house catches on fire and Jacob is stuck. Someone drags him out. Who is it? It's Colton! He runs away. He jumps in the pond and comes back and is very upset for some reason. He sees Alice and he asks if everything is okay in the farm.