Speaking to The Hollywood Reporter, Frain teased that Vince (David Lyons) and Peter will be involved in a number of confrontations in the future.
"They have to go head-to-head," Frain said. "Vince has to confront this guy but he's in a very unusual position of not being able to destroy him.
"The obvious thing to do is to take your revenge and go get the guy who framed you, but he can't do that. He needs to keep this guy alive because he can't prove his real identity without him, and so he realises that to really be free, he has to frame this guy and flip the tables on him. And so it's not just a straightforward combat - it's more psychological warfare."
Frain also suggested that viewers will learn more about Peter as the series continues, saying: "We start to find out that Peter is a little bit more of a ladies' man than we first thought. As the show goes on, the guy who he is by daytime, the guy who he is in the mask, becomes more and more separate and this conflict starts opening up."
He added: "There's going to be some action with a young woman that comes up that's very interesting."
The Cape airs on Mondays at 9/8c on NBC.