'This Is Us': Kate & Marc Turn Sour in 'Hell of a Week: Part 3' (PHOTOS)

Meaghan Darwish

NBC's This Is Us returns Tuesday, February 11, with Part 3 of the "A Hell of a Week" trilogy, and it's Kate's (Chrissy Metz) turn.

In the present timeline of the episode, we will continue with Kate and Toby's (Chris Sullivan) ongoing marital problems. However, the installment will also look closely at the seemingly tumultuous relationship between young Kate (Hannah Zeile) and her then-boyfriend Marc (Austin Abrams).

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Plus, he teases 'wild' things ahead for Kate, working with Justin Hartley on the role and more.

The logline of the episode hints that Kate will find strength in unexpected places — will that via her family or elsewhere? We'll have to wait and find out.

What we do know is Kate calls for help from the Pearson family cabin due to some issue with Marc. In the gallery above, we see the moments leading up to that call, possibly the calm before the storm for the two, who are looking mostly happy here. We also see some moments between Rebecca (Mandy Moore) and Jack (Milo Ventimiglia) — perhaps used to juxtapose with Kate's relationship with Marc... and even Toby?

Click through for a sneak peek!

This Is Us, Returns, Tuesday, February 11, 9/8c, NBC