AceShowbiz -

A preview for the thirteenth episode of "Supergirl" season two has been launched. The sneak-peek video offers a deeper look at Mr. Mxyzptlk, who is portrayed by "Once Upon a Time" star Peter Gadiot.

The 20-second video features Kara (Melissa Benoist) looking gorgeous in a wedding dress while Mr. Mxyzptlk asks Kara, "Will you marry me?" The preview also sees Mr. Mxyzptlk showing up in National City wearing a Superman suit but with an "M" sign written on it. "Are you serious?" says Kara when she finds out that he's not the real Superman.

Mr. Mxyzptlk has been introduced at the end of the twelfth episode of "Supergirl" season two. Wearing a black outfit, Mr. Mxyzptlk makes his first live-action appearance on TV since the character, portrayed by Trent Ford, showed up in the fourth season of "Smallville".

Titled "Mr. Mxyzptlk and Mrs. Mxyzptlk", the thirteenth episode follows Mr. Mxyzptlk, a magical imp, who shows up on Earth and declares his love for Kara. However, Kara tries to let him down easy, thinking him harmless. Mr. Mxyzptlk then decides it's a challenge and starts to wreak havoc on National City.

The thirteenth episode of "Supergirl" season two airs on Monday, February 20 at 8 P.M. ET on The CW.