The previous episode of "Arrow" season 4 reintroduced an old character that fans were happy to see — Constantine played by Matt Ryan.

Constantine possesses a mystical power that allowed him to try to give Sara Lance (Caty Loitz) back her soul. The heroes composed of Oliver (Stephen Amell), Constantine, and Laurel (Katie Cassidy) all went in a journey to the dark realm where Sara's hell-bound soul was discovered. In the end, the good guys were successful in their mission and Sara's soul was returned to her body.

Elsewhere, Diggle (David Ramsey) and Quentin Lance (Paul Blackthorne) were seen collaborating to perform a task for Damien Darhk (Neal McDonough), which is to plant a virus on a government server and interrupt the system. The plan was successful and many files were deleted, including those of Diggle's brother.

In episode 5, Diggle also had to deal with the truth that his brother was killed off by HIVE for being a criminal. This, of course, was a hard thing for Diggle to accept, but eventually he did.

Moving on, everyone thought that Ray Palmer (Brandon Routh) was long dead, but actually he isn't. That means Sara is not the only one who's making a comeback but also the tiny Palmer, whose story will unfold in the next episode. 

Felicity (Emily Bett Rickards) is anxious upon learning that Ray is not dead but is being held captive by Darhk. She feels horrible that she wasn't able to go after and find Ray sooner, and for this reason, tension between her and Oliver will arise, WeGotThisCovered reported.

The team with Laurel, Sara, and Thea (Willa Holland) will then go on to save Ray, but this mission might face hurdles due to the effects of the Lazarus Pit. Charlotte Ross will also make a return in the upcoming episode 6 as Felicity's mom, Donna Smoak.

A new episode of "Arrow" airs every Wednesday at 8 p.m. EST on The CW.