Shadowhunters star Alberto Rosende RTX21OSK
Executive producer Ed Decter (L) and cast member Alberto Rosende (R) participate in a panel for the Disney ABC series "Shadowhunters" (Freeform, the new name for ABC Family) during the Television Critics Association Winter press tour in Pasadena, California, January 9, 2016. REUTERS/Alex Gallardo

"Shadowhunters," starring Katherine McNamara as Clarissa "Clary" Fairchild, Emeraude Toubia as Isabelle Lightwood, Dominic Sherwood as Jonathan Christopher "Jace" Wayland, Matthew Daddario as Alec Lightwood and Alberto Rosende as Simon Lewis, will have a new episode titled "Hail and Farewell," which airs on Monday, Aug. 7 on Freeform. It will show the Downworlders uniting after being fed up with The Clave's poor treatment of their group.

Spoiler alert: This article contains more 'Shadowhunters' spoilers. Read on only if you want to know more about what happens in 'Hail and Farewell.'

"Shadowhunters" season 2, episode 19 will show how the Downworlders will band together and take charge of their own group, without The Clave's assistance. After all, they have been treated poorly and have been lied to a number of times. However, the Downworlders' decision to separate from the Shadowhunters could end up in war. Meanwhile, the search for Sebastian (Will Tudor) and Valentine (Alan van Sprang) will intensify. Matt Hastings directed "Hail and Farewell."

'Hail and Farewell' guest stars

According to the Internet Movie Database (IMDb), Lola Flanery and "Modern Family" star Sarah Hyland will both portray the Seelie Queen in this episode. They will be joined by other stars such as Alexandra Ordolis as Ollie and Alisha Wainwright as Maia Roberts. The other "Shadowhunters" cast members, including Harry Shum Jr as Magnus Bane and Isaiah Mustafa as Luke Garroway, will also make appearances in "Hail and Farewell."

'Shadowhunters' episodes: 'Awake, Arise, or Be Forever Fallen' and 'Beside Still Water'

The episode prior to "Hail and Farewell" was "Awake, Arise, or Be Forever Fallen," which aired on July 31. It was directed by Amanda Row, and it featured an attack at The Institute which left everyone on high alert. Meanwhile, the Seelie Queen returned and she wanted an answer from Luke and Magnus. Elsewhere, the Shadowhunters got closer to finding out Jonathan's whereabouts. Plus, Maia and Simon helped out a new downworlder.

Some of the guest stars that appeared in this episode include Phillip MacKenzie as Brother Enoch, Jack Fulton as Max Lightwood, Tara Joshi as Samantha, Alyssa Capriotti as Lindsay and Kevin Alves as Bat. After "Awake, Arise, or Be Forever Fallen" and "Hail and Farewell," the "Shadowhunters" episode titled "Beside Still Water" will be aired on Aug. 14.

"Shadowhunters 2" airs on Netflix in Australia. It also airs in the US on Mondays at 8 pm ET/PT on Freeform. Stay tuned for more updates about the "Shadowhunters" TV series based on "The Mortal Instruments" by Cassandra Clare.

Check out some photos of the Seelie Queen:

Watch: 'Shadowhunters' | Sarah Hyland, The Seelie Queen - Season 2 Sneak Peek

Source: Shadowhunters TV/YouTube

In case you missed it (ICYMI), check this out:

'Shadowhunters' Season 2 episode 17 spoilers: Jace and Clary search for the Mortal Mirror in 'A Dark Reflection'

'Shadowhunters' season 2 episode 18 spoilers: The Institute gets attacked and the Seelie Queen resurfaces in 'Awake, Arise, or Be Forever Fallen'