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Fan Casting Sadie Sink as Siryn/Theresa Cassidy in Deadpool Merc with the Mouth Season 1 (2026)

user_244913 made this fan casting suggestion on February 18, 2024. What do you think? See below to cast your vote, or click here to see all fan casting suggestions for this role.

Sadie Sink as Siryn/Theresa Cassidy in Deadpool Merc with the Mouth Season 1 (2026)

Sadie SinkUnited States

23 years old
Sadie Elizabeth Sink (born April 16, 2002) is an American actress. She began acting at age seven in local theatre productions and played the title role in Annie (2012–14) and young Elizabeth II in ...
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Siryn/Theresa Cassidy in Deadpool Merc with the Mouth Season 1 (2026)
Fan Casting

Sadie Sink

as

Siryn/Theresa Cassidy (2 Episodes)

in

Deadpool Merc with the Mouth Season 1 (2026)

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Deadpool Merc with the Mouth Season 1 (2026)

Deadpool Merc with the Mouth Season 1 (2026)

JFiction Marvel Max Vol 1
by Marvel Comics, JFiction studios
Follow the adventures of mercenary Wade Wilson as he gets into a world of trouble with lots of enemies.
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Fan casting suggestion made by:

user_244913

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0 comments on Sadie Sink as Siryn/Theresa Cassidy in Deadpool Merc with the Mouth Season 1 (2026)

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Sadie Sink is known for her roles in The Glass Castle, Fear Street: 1666, and Fear Street: 1978. She has been suggested by fans for 13,577 roles on myCast, including Rachel Dare in Percy Jackson & the Olympians. Similar actors include Emily Alyn Lind, Auliʻi Cravalho, and Emily Skinner. Sadie Sink was suggested to play Siryn/Theresa Cassidy in Deadpool Merc with the Mouth Season 1 (2026) by user_244913. Deadpool Merc with the Mouth Season 1 (2026) has 15 roles, including Ajax/Francis Fanny, Vanessa Carlysle, and Weasel.

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