Underdog Crossovers
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Rocky and Bullwinkle in: “Underdog Returns” or “Literal Atomic Dog” by Ek01
In this crossover with Underdog, Rocky and Bullwinkle team up with said superhero to take down the grandchild of one of his old villains, who in turn teamed up with Boris and Natasha.
Crossover - Rocky and Bullwinkle & Underdog - Rated: K+ - English - Sci-Fi/Parody - Chapters: 7 - Words: 2,937 - Updated: 2/18 - Published: 2/10 - Complete
A Cousin's Visit by meyerjon1996 reviews
Mr. Peabody Sherman Penny Paul and Patty visit Providence Rhode Island where they meet Mr. Peabody's cousin and then meet Underdog.
Crossover - Underdog & Mr. Peabody & Sherman - Rated: K+ - English - Adventure/Family - Chapters: 4 - Words: 3,210 - Reviews: 4 - Favs: 4 - Follows: 4 - Updated: 12/17/2020 - Published: 8/20/2019 - Mr. Peabody, Sherman P., Penny P.
It's a Dog's Life by Evil Little Dog reviews
Talking dogs should probably be the least of their worries, but, there you go.
Crossover - Underdog & Avengers - Rated: K+ - English - Humor - Chapters: 1 - Words: 502 - Reviews: 6 - Favs: 12 - Follows: 5 - Published: 7/31/2013 - Iron Man/Tony S., Hulk/Bruce B., Nick F. - Complete