'Shadowhunters' Season 2 episode 15 spoilers: Alec and the others prepare Valentine's transportation in 'A Problem of Memory' [VIDEOS]

Shadowhunters star Matthew Daddario RTR418T6 — Cast member Matthew Daddario poses at the premiere of the film "When The Game Stands Tall" in Los Angeles, California August 4, 2014. The film opens in the U.S. on August 22. REUTERS/Kevork Djansezian

"Shadowhunters," starring Matthew Daddario as Alexander "Alec" Lightwood, Dominic Sherwood as Jonathan Christopher "Jace" Wayland, Katherine McNamara as Clarissa "Clary" Fairchild, Emeraude Toubia as Isabelle Lightwood, Alberto Rosende as Simon Lewis, Isaiah Mustafa as Luke Garroway and Harry Shum Jr. as Magnus Bane, will have a new episode titled "A Problem of Memory," which airs on Freeform on July 10. It will show Valentine Morgenstern (Alan van Sprang) being prepared for transport by Alec and his allies. Read on to learn more about it.

Spoiler alert: This article contains more 'Shadowhunters' spoilers. Read on only if you want to know more about what happens in 'A Problem of Memory.'

According to the Internet Movie Database (IMDb), in "Shadowhunters" Season 2, episode 15, Alec and his team will prepare to transport Valentine. Meanwhile, Simon is headed down a dark road.

A promo video of the episode was released on Freeform. It shows scenes featuring Clary telling Simon that she loves him. However, Simon doesn't think that Clary loves him the same way he does. It doesn't help that the memory of seeing Jace and Clary kiss passionately is still fresh. "It was real. I felt it and I know Clary did too," Jace tells Isabelle about the said kiss.

Meanwhile, Valentine will tell Jace that his love for Clary will be his downfall. As for Magnus, he will tell Alec that he never wanted him to see his "terrible and ugly side." Plus, another scene shows Simon biting a woman and telling Clary that he thinks he might have killed her. Check out the video at the end of the article.

'A Problem of Memory' guest stars

IMDb also lists Chad Connell (Quinn), Eileen Li (Aline Penhallow), Tessa Mossey (Heidi) and Alexandra Ordolis (Ollie) as guest stars of this episode. They will be joined by Elias Toufexis (Jonathan) and Will Tudor (Sebastian Verlac).

'Shadowhunters' episodes and recap

The episode before "A Problem of Memory" was "The Fair Folk," which aired on June 26. It was written by Taylor Mallory and directed by Chris Grismer. It featured the Seelies and their queen who summoned Jace and Clary into their world. Unfortunately, the Seelies can manipulate the truth, which left Clary, Jace and Simon confused. The Seelie Queen even demanded that Clary choose between Simon and Jace by kissing the one that she most desires. At first, Clary chose to kiss Simon, but the Seelie Queen wasn't convinced. It wasn't until she kissed Jace that she freed the two boys wrapped in vines. Watch the video at the end of the article to see Jace and Clary's kissing scene.

The other episodes after "A Problem of Memory" are "Day of Atonement," which will air on July 17, and "A Dark Reflection," airing on July 24. After that, the episodes titled "Awake, Arise, or Be Forever Fallen" (air date: July 31), "Hail and Farewell" (air date: Aug. 7) and "Beside Still Water" (air date: Aug. 14) will be shown on Freeform.

The "Shadowhunters" TV series is based on "The Mortal Instruments" book series by Cassandra Clare. The show airs on Netflix in Australia. It also airs on Freeform in the US on Mondays at 8 pm EST.

Watch the 'Shadowhunters' videos below from the Freeform YouTube channel: