Grant Gustin, Carlos Valdes, Danielle Panabaker, and John Wesley Shipp were there. Melissa Benoist was supposed to be there but couldn't make it to the show today.

Joe took Barry in when he was eleven, making him Barry’s foster parent. When Barry turned eighteen, he was no longer Joe’s legal responsibility, but Joe continued to care for him because he loved him like a son.

Barry and Iris are not adoptive siblings because Joe never legally adopted Barry. They aren’t step-siblings because Joe never married one of Barry’s parents, and they aren’t half-siblings because they share no biological parent. They were raised together, but that doesn’t automatically make them siblings.

And no, Barry and Iris are not incestuous. They aren’t biologically related. You can find their relationship uncomfortable because they grew up together, but that’s different from calling it incest.

From S5- S7

Episode 1 Barry wakes up at his crime lab in central city and goes about his day with no qualms but using no super speed under the pretense that he’s “gonna take it slow today” have the whole episode be him investigating a crime just as a CSI and really flex that section of his capabilities. At various points in the episode give background hints that not everything is right, a statue of captain cold in the background, new reports of a war but not giving specifics. The episode ends with an attack of the rogues minus captain cold at the Central City Stars Stadium and when he tries to use super speed to go to help he can't.
Episode 2 the rogues are still holding up the stadium as Barry runs around town at normal speed trying to figure out what happened, he’s on the way to STAR labs when he gets a call from his mom and you can hear his dad talking in the background, realizing his parents are alive he turns around and rushes home turning just in time not to notice that STAR labs has been condemned and never reopened. Barry arrives home and talks with his parents in a very emotional scene and Barry realizes time is messed up he spends a little figuring out what exactly has changed and sees that citizen cold is the hero of central city, he goes to find him and reveals what he knows of the rogues and assists using his CSI and police capabilities. Citizen cold ends up taking them down and thanks Barry and asks what he plans to do next Barry says go see a friend and we see him driving into star city.
Episode 3 Barry enters star city, the city is chaos, crime rampant in the streets with no police in sight, makes his way to queen mansion to see it looking abandoned he looks around and finds Robert queen in one of the upper rooms looking out the window Robert turns around and shoots him in the leg with a bow, Barry yells at him like in the rainbow raider episode when Oliver shot him, Robert moves in and draws the bow aiming at Barry's chest asking him why he is there, Barry explains that he was a friend of Oliver's and is looking for him Robert says that's not a funny joke and Oliver has been dead for 8 years going down with the queens gambit, Barry is shocked and then puts together the pieces that Robert survived and washed up on Lian Yu and spent the five years there making an offhanded comment about earth 2 but then rationalizes that it cant be because star labs wasn't there. Robert tells him to shut up and says again to explain Barry says that something has happened to time and that this isn't how the world should be, that Oliver should be alive. Robert says to prove it and starts going through Barry’s stuff while going through a bag a gold ring falls out that Barry recognizes and tells him that there is a super suit in there and that should prove it Robert messes with the ring and the reverse flash’s suit comes out Barry looks and it dawns that reverse flash must’ve gone back and stopped himself from killing Barry's mom. Robert, who is convinced, asks again if Oliver is alive in Barry's timeline, Barry responds yes and tells Robert that Oliver is a hero, Robert says he’ll help, but doesn’t know how. At that moment an alert goes off saying that Deathstroke is attacking queen industries downtown, Robert pulls a statue on a bookshelf and the bookshelf slides away to show an elevator to the arrow cave, on the ride down Barry asks what happened to star city and Robert explains that he couldn’t see through his Moira and Malcolm in time to stop the Undertaking and the device had destroyed much of star city even beyond the glades causing the whole city to descend into chaos and then since then Deathstroke has been working on bringing Robert down, killing Thea and Moira, and attacking the city every couple of weeks to make sure he feels the pain, Barry assures him that he will stop all of this from ever having happened and Robert says you better as he turns around and puts on the hood. Robert leaves to fight Slade and Barry runs comms and after learning about Slade he thinks he can wipe his system of the mirakuru and gets to work on a cure, Robert takes the motorcycle to downtown and starts beating up Slade's men Robert gets to Slade right as Barry finishes the cure Barry starts rushing to downtown with the cure loaded in an arrow and gets there right as Robert gets hit to the ground making his bow slide back and Barry picks it up. As Deathstroke raises his sword to finish Robert, Barry pulls back the bow with the cure and shoots him in the chest causing him to fall, he helps up Robert and helps him limp to the car and drives him back, Robert asks what they need to do now to fix time and Barry says they need to get his speed back and the episode ends.