First off, we were thrown quite a few fresh faces this season, and those characters' purposes were either moot, abandoned, or given fairly predictable endings (okay, maybe not Grace shooting herself on top of the Santa Monica Ferris wheel, but still).
Grace (Mae Martin) was introduced early on as one of the other flight attendants Cassie was working with, and she definitely gave off some odd vibes upon our first meeting. Cassie herself was pretty skeptical of her, stalking Grace at her house and eventually rummaging through her apartment. However, after that, it was sort of as if Grace didn't exist—we didn't see much of her until the very end when she confronted Cassie at the Santa Monica Pier. It just seemed like a bit of a cop-out to kill her off like that.
On top of her, we met a creepy (and murderous?) couple, Gabrielle and Esteban Diaz (Callie Hernandez and J.J. Soria), who have seemingly been tracking Cassie since she arrived in Berlin in the first episode. They were on her tail from the very beginning, traveling all the way back to Los Angeles to tie up an elderly couple across the street from Cassie and then Annie (Zosia Mamet) and Max (Deniz Akdeniz). Later on, they followed Cassie to the Santa Monica Pier and almost killed Annie and Max (again), though Annie was able to save the day. All of that to say, I genuinely don't know why they were involved at all. A smokescreen, I guess? Because we really weren't given any explanation as to why they were included in the plot at all.
Cheryl Hines was also brought on as Dot Karlson, regional director of the CIA who crosses paths with Cassie as she's working under Benjamin Berry (Mo McRae). Ultimately, Karlson turns out to be the mastermind behind this whole situation that has had Cassie running around trying to figure out who's responsible for framing her. But I don't know, there's just something about Cheryl Hines that makes it extremely difficult for make to take her seriously as some sort of secret serial killer with the random agenda to frame Cassie for all of her crimes. Actually, I know the reason—it's because every time I see Cheryl Hines in anything I think of that scene in Curb Your Enthusiasm where she gets stuck in a car wash and has to leave mid-ride. So maybe this is a Me Problem.
Then we have Jenny (Jessie Ennis), the extremely annoying member of Alcoholics Anonymous (AA) whom Cassie feels forced to take under her wing. She's extremely interested in Cassie's past with Alex Sokolov, forming a weird friendship with Cassie's brother, Davey (T.R. Knight), that ends in her drugging him and running after Cassie with a massive hammer in hand. Apparently, she had met Buckley Ware (Colin Woodell) and became obsessed with him, though he was still hung up on his ex, Cassie. With that, Jenny set out to befriend Cassie and then murder her, though Davey and Cassie were (barely) able to take her out before that was able to happen.
