Castle season 7 will feature an interesting storyline in its 16th episode. The newly reunited small-screen tandem are about to go on a mission outer space just so they could solve another murder mystery. Well, not really outside of planet Earth, but they will experience what it's like to be on Mars when they try to investigate on a case involving the death of an astronaut-in-training. Don't miss the brand new episode tonight. Tune in on ABC at 10 p.m EST or watch Castle season 7 episode 16 stream using the free online stream link below.

Note: This feature contains spoilers on the upcoming episode of Castle Season 7. Kindly read at your own risk.

Previously on Castle Season 7, the two-part arc featuring the kidnapping of Kate Beckett wrapped up with the reunion of the lovebirds. The 12th Precinct did their best to match the wits of notorious serial killers Jerry Tyson and Dr. Kelly Neiman. This week, they will face new perpetrators of crime when a new case is presented to them. Surprisingly, they discover that no other person could have killed the victim than himself. So did he commit suicide or was there someone responsible for his death? Find out by tuning in on ABC tonight at 10 p.m. EST. Watch Castle season 7 episode 16 online through the free online stream link at the end of this post.

Castle and Kate are about to suit up for an out-of-this-world adventure. When they are presented with a murder case involving an astronaut, who died while having a Mars simulation training, they start to question of it was possible for someone else to enter the training room at the time of the death of the victim. As suspenseful as the previous two episodes, Rick Castle will uncover the truth behind the strained relationships of people working at the training center and will ultimately uncover the identity of the killer. Don't miss the brand new episode. Watch Castle season 7 episode 16 stream using the free online stream link at the bottom.

The official synopsis of Castle season 7 episode 16 reads: "When an astronaut training for a trip to Mars is mysteriously killed inside a Mars simulation, Castle and Beckett don spacesuits to investigate. But when they discover no one inside the sealed simulation could have committed the murder and no one from the outside could get in, the case takes a shocking turn."

Guest starring this week are Yves Bright, Gwendoline Yeo, David Rogers, Sterling K. Brown and Maxwell Caulfield, among others.

"The Wrong Stuff" is set to air this Monday night at 10 p.m. EST on ABC. Watch Castle season 7 episode 16 stream using this free online stream link here.