|This article is about a/an episode in Himitsu Sentai Gorenger.|
Multi-Changing Blue Veins! The Dreadful Poison Expert (青すじ七変化! 恐怖の毒薬博士 Aosuji Shichi Henka! Kyōfu no Dokuyaku Hakase) is the twenty-sixth episode of Himitsu Sentai Gorenger.
The Gorenger deal with a poison-expert Masked Monster attacking victims to gain a powerful weapon for the Black Cross.
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- This episode aired on NET the same day episode 29 of Kamen Rider Stronger, The Curse of Majin Kate's Blood!, aired on TBS.
- The Japanese title for this episode includes the word "aosuji", which is the Japanese word for "vein" yet also includes the "ao" (blue) kanji, thus keeping the color theme every Gorenger episode holds.
Himitsu Sentai Gorenger Volume 5 features episodes 25-30: Ep. 25: Crimson Fuse! Lamprey Torpedo Attack, Ep. 26: Multi-Changing Blue Veins! The Dreadful Poison Expert, Ep. 27: Yellow Object Q! Gorenger Base S.O.S., Ep. 28: Big Red Eruption! Infiltrate the Underground Base, Ep. 29: Red Pursuit! The Mysterious Seal Train, and Ep. 30: Golden Columns of Fire! A Great Explosion of Consecutive Mines. 
Blu-ray Box 2 comes with 17 episodes.