Speaking with her friend, Caitlyn admits that Khloe Kardashian is upset because she didn't like the Vanity Fair article.
The promo then cuts to Kim offering up some tough love to Caitlyn. "You look amazing. It's your time," she says. "But you don't have to bash us on your way up."
"I told her she's a tomboy," Kim confessed. "Because she really likes off-roading and doing all the things that she did before."
As for I Am Cait, viewers can expect some tense moments. Several times, Caitlyn is seen tearing up while listening to other transgender people tell their story. She also breaks down talking about the struggles she's facing in her own journey.
"Because of my status, everyone is looking at me as the spokesperson for the transgender community," she says of the pressure she's feeling. "I'm thinking about my family and I'm thinking about all this kind of stuff and I'm struggling with it."
While emotions do run high on I Am Cait, there are lots of fun moments.
The reality star gets a little flack from her friends for the proposition when she hits the pool in a white swimsuit and cover-up. "Bathing suits, you need a sexy one for Candis," her pal quips.
Caitlyn bites back, "We're not going there."
Caitlyn also embarks on a road trip with her gal pals and learns what happens during a slumber party. "You pillow fight. You tell ghost stories. You compare your boob sizes," her friend explains.
The former Keeping Up With the Kardashians star goes on to share her mission in doing this show. "What I'm hoping for is that the world is going to follow along with me," Caitlyn says. "And we can learn together."
I Am Cait airs Sunday nights at 8 p.m. only on E!