"Switched at Birth" alum Gilles Marini and "The Young and The Restless" actor Lachlan Buchanan will make a cameo appearance for "Teen Wolf" Season 5. Marini will portray as the war veteran Sebastian and Buchanan as Henri the Argent. Crystal Reed also returns in the show as Marie-Jeanne, a peasant girl. Plus, MTV finally released the plot description for "Amplification".

"Switched at Birth" star Gilles Marini and "The Young and The Restless" actor Lachlan Buchanan officially sign in as guest stars for "Teen Wolf" Season 5. According to TV Line, Marini will portray the character of Sebastian, a French war veteran who returns to his hometown Gevaudan. On his homecoming, he will discover that a vicious beast has been torturing his loved ones including his younger sister.

Then Buchanan will play the role of Henri, a wise Argent who has a bit of knowledge about the supernatural world. Henri lives alone in a remote forest grove. Marini and Buchanan's characters will make a cameo appearance in the February 23, 2016 flashback episode of the show.

In addition, Crystal Reed also returns on set to play the character of Marie-Jeanne Valet. Christian Post describes her character as a peasant girl who survived the attack of the beast.

As for the official synopsis of episode 15, Hollywood Hills notes, "Stiles Stilinski (Dylan O'Brien) is going to end up learning that Lydia Martin (Holland Roden) is in imminent danger and will develop a plan to break her out of Eichen House. Theo Raeken (Cody Christian) will, however, have his own plans for her."

"Teen Wolf" Season 5 Episode 15 is entitled as "Amplification". The forthcoming episode is scheduled to premiere on Tuesday, February 2, 2016 at 9:00 p.m. exclusively on MTV. "Teen Wolf" is an American TV series developed by Jeff Davis. The storyline is based on Jeph Loeb's 1985 film under the same name.