VARIETY – The “Shadowhunters” cast made an appearance at WonderCon on Friday afternoon to tease the final two episodes of Season 1, kicking off with a clip of next week’s much-anticipated episode 12, titled “Malec.”

The sneak peek sees everyone gathered for Alec’s (Matthew Daddario) wedding to Lydia (Stephanie Bennett), but before they can get to the vows, Magnus (Harry Shum, Jr.) arrives to interrupt the proceedings, since Alec’s sister Isabelle (Emeraude Toubia) secretly invited the warlock to the nuptials. Alec’s mother, Maryse (Nicola Correia Damude) tries to make Magnus leave, but he tells her he has business with her son and that he won’t leave unless Alec asks him to — with the clip ending before we see Alec’s response.

“Alec at this point is not just lying to himself, he’s actively building up walls to prevent him from feeling what’s actually going on inside of him,” Daddario said of Alec’s mental state in next week’s episode. “All the distractions and various issues brought on by all of these people… he has a lot to think about.” Despite some questionable choices so far this season, Daddario said that he likes to think that in most situations, “Alec makes the right decisions in the end.”

Alec and his best friend, Jace (Dominic Sherwood), have been at odds lately, but both actors reiterated the strength of their bond. “I don’t think Jace and Alec can ever break up permanently,” Daddario laughed, with Sherwood adding, “The love that Alec and Jace feel for each other is so complete and unending, that when it does reach a head and they come to blows, it’s because they love each other and they care about each other … Without passion there’s nothing.”

But many fans are rooting for another kind of love connection for Alec, and Shum teased that next week’s episode will “see a little backstory” from Magnus, including what brought him to this point. According to Shum, “you’re gonna see how many walls he’s built and that it’s a big deal for him to be flirtatious” the way he has been with Alec.

Following the bombshell that Clary (Katherine McNamara) and Jace may be half-siblings, Alberto Rosende teased that Simon’s starting to have hope that he might have a chance to win Clary’s affections after all. “Simon’s always making plays for Clary, that’s kind of his MO. He’s starting to get a little more confident,” he said with a laugh. “For the first time, there’s no threat anymore [from Jace] – I can swoop in.”

“Shadowhunters” was renewed for a second season last week, so showrunner Ed Decter admitted that they haven’t started writing the scripts for Season 2 yet, but promised, “We have a really action-packed season planned — a lot of things you loved about the books may happen, but may happen in a completely different way than in the books.” He noted that it’s their job to surprise fans of Cassandra Clare’s books just as much as new fans of the franchise.

When asked whether book character Sebastian would make an appearance on the show, Decter confirmed that they planned to introduce him at some point. “Sebastian will be in the series, but we need to maybe get picked up again,” he teased.

The cast and producers were tight-lipped about what to expect from the April 5 season finale, but Decter would reveal that the ending “will be a substantial cliffhanger” to keep fans guessing between Season 1 and Season 2.