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)

Jeremy Jordan as Winn Schott/Toyman in Supergirl - Season 5 Episode 13
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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)

Katie McGrath as Lena Luthor and Jeremy Jordan as Winn Schott/Toyman in Supergirl - Season 5, Episode 13
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Alex (Chyler Leigh) and Winn

Supergirl Season 5 Episode 13 J'onn
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J’onn

Nicole Maines - 'Supergirl' Episode 100
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Nia (Nicole Maines)

Thomas Lennon as Mxyzptlk and Melissa Benoist as Kara/Supergirl in Supergirl - Season 5, Episode 13 - 'It's a Super Life'
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Mxyzptlk (Thomas Lennon) and Kara

Thomas Lennon as Mxyzptlk and Melissa Benoist as Kara/Supergirl in Supergirl - Season 5, Episode 13 - 'It's a Super Life'
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What are they looking at?

Supergirl - Season 5 Episode 13 - Thomas Lennon as Mxyzptlk, Melissa Benoist as Kara/Supergirl and Nicole Maines as Nia Nal/Dreamer
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Mxyzptlk, Kara, and Nia

Supergirl - Season 5 Episode 13 - Thomas Lennon as Mxyzptlk, Melissa Benoist as Kara/Supergirl, and Nicole Maines as Nia Nal/Dreamer
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Nia’s not impressed.

Supergirl - Katie McGrath as Lena Luthor and Melissa Benoist as Kara/Supergirl
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Can their friendship be repaired?

Katie McGrath as Lena Luthor and Melissa Benoist as Kara/Supergirl in Supergirl - Season 5 Episode 13
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Lena (Katie McGrath) and Kara

Katie McGrath as Lena Luthor hugging Melissa Benoist as Kara/Supergirl in Supergirl - Season 5 Episode 13
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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.

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