User blog comment:Andrew0218/Red vs Giygas. Monstrous Rap Battles/@comment-25263388-20150202091917

Triffids vs Audrey II ft. Ivy (not Poison Ivy, just Ivy), Killer Tomatoes and Body Snatchers - a royale of the killer plants, ending with the original killer plant group

The Birds (Hitchcock) vs the Harpies

Cerebrus vs Ghidora - since you didn't reply to the other suggestion of it really :p

Scorpion vs Ghost Rider?

The Endless vs the Daedra

The giant squid from Game & Watch vs the giant squid from Night at the Museum :p