They join a cast that includes Finn Jones as Danny Rand/Iron Fist, Jessica Henwick as Colleen Wing, and David Wenham, who will play Joy and Ward's father, Harold Meachum.
"The children of Harold Meachum (Wenham), Joy and Ward have spent their lives building Rand Enterprises to its current standing in the world, only to have all their work put in jeopardy when Danny returns to claim his birthright," reports Variety. "They are childhood acquaintances of Danny Rand's who now play an important role in Rand Enterprises."
Stroup, 29, is best known for playing Erin Silver on The CW's 90210 reboot and starring in horror films, like Prom Night and The Hills Have Eyes 2.
Tom Pelphrey, 33, made a name for himself with notable roles in the soap opera Guiding Light and As the World Turns. More recently, you might have seen him as former neo-nazi Kurt Bunker on Cinemax's action drama Banshee.
In Marvel's Iron Fist, Danny Rand returns to New York City after being missing for years. He fights against the criminal element corrupting New York City with his incredible kung-fu mastery and ability to summon the awesome power of the fiery Iron Fist.
Iron Fist is expected to premiere on Netflix in 2017.
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Batman v. Superman: Dawn of Justice is now playing in theaters.