“The Fosters” returns with an intense premiere Monday. The first episode of Season 4 will not waste any time before putting beloved characters into a life-threatening situation. Marianna’s boyfriend Nick will bring a gun to school and force Anchor Beach Charter School to go into lockdown. Check out what we know about the dramatic episode:

1. PSA — The episode was filmed months ago, but actresses Cierra Ramierez (who plays Marianna) and Sherri Saum (who plays Lena) have filmed a special message that addresses the Orlando, Florida, shooting, TV Guide reports. The premiere will be dedicated to the victims of the attack.

2. Callie’s Confession — Callie (Maia Mitchell) finally came clean about her relationship with Brandon (David Lambert) at the end of last season, but that’ll have consequences. Luckily, fans won’t have to wait long to see it addressed. “When we first come into the premiere episode, we are dealing with that,” executive producer Bradley Bredeweg revealed to TVLine. “Callie is sitting in Lena’s office and confronting the moms and coming forward with truths and telling them what really happened. It’s a pretty heartbreaking moment.”

The Fosters Stef (Teri Polo) has to prepare for the worst when a student brings a gun to Anchor Beach’s campus. Photo: Freeform

3. Nick’s Jealousy — The episode synopsis reveals it was seeing Marianna kiss Mat (Jordan Rodrigues) that prompted Nick (Louis Hunter) to bring his father’s gun to school.

4. Marianna Is Alone — During the school lockdown, Marianna will end up on her own. “She’s the one that has been locked out, and that’s part of the protocol,” Bredeweg explained. “Once you lock the door to your classroom, you are not to open it for anyone until a SWAT team or a member of the police force arrives. So it is a very scary situation for Mariana, because she has no one. She is truly locked out during the lockdown.”

5. Jesus and Emma — It looks like Emma (Amanda Leighton) and Jesus’ (Noah Centineo) relationship might start moving fast in this sneak peek video:

6. Jude’s Sexuality — After dealing with Jack’s death, Jude (Hayden Byerly) begins to wonder if he is seeing signs that he shouldn’t be gay. “I think that he sees that he shouldn’t be gay, and then he starts to look at all of these interesting things, that Jack has died after he kissed him, that Connor moved away,” Byerly told KSite TV. “And I think that he looks at it as some outside force or being trying to push him away from being gay, and trying to isolate him and show him that he’s not supposed to do that. And so, he looks towards Christianity as his saving grace.”

“The Fosters” Season 4 premieres Monday, June 20 at 8 p.m. EDT on Freeform.