Legends of Tomorrow will return for its midseason premiere with plans to reinvent its Season 4 villain.

Showrunner Phil Klemmer revealed that Hank Heywood, Nate's father who works for the demon Neron, was planned as an unrepentant antagonist that would cause Nate to become estranged from his teammates. After casting actor Tom Wilson, though, it was decided to make Hank a much more sympathetic, likable character instead.

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"Before Nate’s father was Tom Wilson, our notion of the Big Bad was always a military guy who works for the Pentagon who is going to torture creatures and turn them into super soldiers," Klemmer told TVLine. "But when we saw Tom Wilson in action and got to know him as a person, immediately our plans were dashed. We were like, ‘He can’t just be the bad guy. There’s something deeply lovable about this human being.’”

With that in mind, the writers decided to have Hank brought in to help Neron through the Pentagon under false pretenses, only to have a crisis of conscience as he reconnects with his son and learns Neron's true agenda. However, while Hank may be attempting to make amends, this season's conflict will open a rift between Sara Lance and Ava Sharpe.

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"As we make things more complicated between Nate and his dad, at the same time you inadvertently do the same thing between Sara and Ava, since they represent the heads of these two institutions that are kind of falling out of sync," Klemmer continued. "The Legends have been effectively working cheek to jowl with the Time Bureau, so we were looking to complicate things.”

Returning for its midseason premiere on Monday, April 1 at 8 pm ET/PT on The CW, DC’s Legends of Tomorrow stars Caity Lotz, Dominic Purcell, Brandon Routh, Nick Zano, Maisie Richardson-Sellers, Tala Ashe, Matt Ryan, Jes Macallan and Courtney Ford.