“If you’re unfamiliar, Compound Hulk is a mashup of the Green Hulk and Red Hulk – a short-lived character that appeared in 2011’s Hulk #30 (Comixology), by Jeff Parker and Ed McGuinness. The story involved General Thunderbolt Ross aka Red Hulk joining forces with Bruce Banner to fight Xemnu. Xemnu found ways to negate their powers individually, but thanks to the Impossible Man, Green Hulk, and Red Hulk were able to merge into one body to overcome their individual weaknesses.” – Comicbook.com