The Deadpool Corps. is a diverse and strange collection of variants of the hero, led by Lady Deadpool, played by Ryan Reynolds' real-life partner Blake Lively.
However, Lively isn't the only cameo among the Deadpool Corps. Nathan Fillion is there as Headpool, and Matthew McConaughey snuck into the film as a Cowboy Deadpool.
Reprising the role of Sabretooth for the first time since 2000's "X-Men," Tyler Mane returns to have a showdown with Wolverine and Deadpool in the Void.
Although his time on screen is short, Mane's Sabertooth looks imposing and creates a tie back to the very beginning of this shared universe created initially by 20th Century Fox.
Pyro first appeared in the 2000 "X-Men" film, but Aaron Stanford didn't step into the role until 2003's "X2: X-Men United" and again in "X-Men: The Last Stand."
Jon Favreau returns to the MCU as Happy Hogan, Tony Stark's former chauffeur who first appeared in 2008's "Iron Man." The cameo is brief but hilarious.
Happy is vital to Deadpool's arc, as he dashes Wade's dreams of becoming an Avenger. However, he also tells the hero to keep at it as the Avengers would be watching him.