Steven

"'I feel like I'm sitting on an atomic bomb waiting for it to go off.'"

Steven is a character who appears during Johnny's party.

In "The Room"
Steven first appears at Johnny's birthday party, with the others, greeting Johnny as he walked in. They all sing "Happy Birthday" to Johnny. Steven talks to Lisa, but Mark motions her over to make out with him. Lisa sends everyone outside so she can make out with Mark. Steven barges in and asks "What's going on here?", and further interrogates them about the affair. (If this were Peter and not Steven, Peter would have now had definitive proof that Mark and Lisa had an affair.) Mark delivers his famous line, "Leave your stupid comments in your pocket!". Steven continues to lecture Lisa as Mark exits.

Steven is next seen talking to Michelle, as Johnny makes his announcement about them expecting. Michelle tells Lisa to be honest with Johnny, and Steven agrees with that. Steven asks Lisa when the baby is due and Lisa tells him it was another lie to "make it interesting". Michelle tells Lisa that the lying is getting worse and worse, and Steven says he feels like he is sitting on an atomic bomb. Michelle and Steven continue lecturing Lisa and Lisa keeps trying to avoid the question, saying it is none of their business. Steven tells Lisa that her actions were shaking up their group of friends, and that Mark does not really love her. Lisa says for the millionth time "I don't want to talk about it."

Steven is later seen mediating the fight between Johnny and Mark.

Behind The Scenes
Steven was created as a replacement for Peter. According to Greg Sestero's book "The Disaster Artist", Kyle Vogt, who portrayed Peter, had another acting job immediately after his schedule with "The Room" but Tommy Wiseau didn't finish shooting Vogt's scenes in time.