Thomas Lennon Guest Stars as Mxyzptlk in 'Supergirl' 100th Episode (PHOTOS)

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Supergirl Season 5 Episode 13 It's a Super Life Photos
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Melissa Benoist Supergirl Season 5 Episode 13 Kara
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Kara (Melissa Benoist)

Supergirl Season 5 Episode 13 Winn
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Winn (Jeremy Jordan)

Supergirl Season 5 Episode 13 J'onn Kelly
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J’onn (David Harewood) and Kelly (Azie Tesfai)

Supergirl Season 5 Episode 13 Alex Winn
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Alex (Chyler Leigh) and Winn

Supergirl Season 5 Episode 13 J'onn
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J’onn

Supergirl Season 5 Episode 13 Nia Dreamer
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Nia (Nicole Maines)

Supergirl Season 5 Episode 13 Mxyzptlk Kara
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Mxyzptlk (Thomas Lennon) and Kara

Thomas Lennon Supergirl Season 5 Episode 13 Mxyzptlk
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What are they looking at?

Mxyzptlk Supergirl Season 5 Episode 13 Kara Nia
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Mxyzptlk, Kara, and Nia

Supergirl Season 5 Episode 13 Mxyzptlk Kara Nia
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Nia’s not impressed.

Supergirl Season 5 Episode 13 Kara Lena
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Can their friendship be repaired?

Supergirl Season 5 Episode 13 Lena Kara
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Lena (Katie McGrath) and Kara

Supergirl Season 5 Episode 13 Lena Kara Hug
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How will the 100th episode affect their relationship?

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Mxyzptlk returns to Supergirl on February 23 for its milestone 100th episode — and he might be able to help Kara (Melissa Benoist) get her best friend back.

Previously portrayed by Peter Gadiot in Season 2, the trickster is now being played by Thomas Lennon. And this time, he has a proposition for Kara: What if she could go back in time and tell Lena (Katie McGrath) the truth before Lex (Jon Cryer) did? "It's a Super Life" looks back over key moments throughout the series as Kara decides if she wants to change history in order to be friends with Lena again.

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How close will Kara and William get when they investigate Lex Luthor?

Click through the gallery above for a look at Lennon's guest spot, what looks like an emotional conversation between Kara and Lena, and more.

Supergirl, Sundays, 9/8c, The CW