Peter Gadiot has signed on to play Mister Mxzptlk in Supergirl, according to Heroic Hollywood.
The character will appear in two episodes of the series.
Mxyzptlk is one of Superman’s antagonists. Although not an actual threat to the hero, he acts as more of a nuisance. He comes from the 5th dimension, and the only way to send him back is tricking him into saying or spelling his name backwards.
Supergirl returns to The CW on January 23 with Kevin Smith’s episode, Supergirl Lives.
“Supergirl Lives” — (8:00-9:00 p.m. ET) (TV-PG, V) (HDTV)
KEVIN SMITH DIRECTS; ROULETTE RETURNS — Kara (Melissa Benoist) is moved by the story of a missing woman named Izzy (guest star Harley Quinn Smith) and decides to investigate despite Snapper Carr’s (guest star Ian Gomez) order to leave it alone. Kara takes Mon-El (Chris Wood) with her to the last place Izzy was seen and the duo find themselves thrust through a portal to another planet, Slaver’s Moon, where the downtrodden are sold as slaves. The leader of the trafficking ring is none other than Roulette (guest star Dichen Lachman). To make matters worse, Slaver’s Moon has a red sun, which means Kara and Mon-El are stripped of their powers and stuck on the planet with no way home. Meanwhile, back on Earth, Alex (Chyler Leigh) blames herself for Kara’s disappearance, fearing she’s become too focused on her new relationship with Maggie (guest star Floriana Lima) and too complacent in watching out for her sister. Kevin Smith directed the episode with story by Andrew Kreisberg and teleplay by Eric Carrasco & Jess Kardos (#209). Original airdate 1/23/2017.”