• Cast members (L-R) Michael Weatherly, Pauley Perrette, Rocky Carroll, Mark Harmon, Cote de Pablo and David McCallum participate in a panel for CBS series NCIS during the CBS sessions at the Television Critics Association winter press tour in Pasadena, Cal

Cast members (L-R) Michael Weatherly, Pauley Perrette, Rocky Carroll, Mark Harmon, Cote de Pablo and David McCallum participate in a panel for CBS series NCIS during the CBS sessions at the Television Critics Association winter press tour in Pasadena, Cal (Photo : REUTERS/Phil McCarten )

"NCIS" Season 12 returns with Episode 20 on April 7, 2015. The upcoming segment is titled "No Good Deed" and it will focus on Tony DiNozzo and his partnership with his girlfriend Zoe Keates for a case that unveils the role of ATF. Here are few spoilers for the next episode of "NCIS" Season 20. Read on to find out what happens next.

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Spoilers alert! This article contains spoilers from "NCIS" Season 12 Episode 19 and 20. Read only if you want to learn more about it.

In the last-aired episode, a petty officer's murder leads to the reopening of a 40-year-old cold case. McGee and Bishop have been working on the bombing attack on the airport that occurred in 1979 for years. However, it remains unresolved until Leroy and Anthony discovered how the current murder case can help solve the cold case.

Episode 20 "No Good Deed" is expected to delve deeper into Tony and Zoe's relationship. Tony and Zoe will come together to work on a complex case involving ATF. The case is speculated to stir up tension between the two agencies.

According to the official synopsis (via Spoiler TV) for "NCIS" Season 12 Episode 20 "No Good Deed," a new evidence in a murder case urges the two agencies, NCIS and ATF, to perform joint investigation. Tony and his girlfriend Zoe, who happens to be ATF Special Agent, team up to work on the case. Previous investigation of a case assigned to NCIS reveals that weapon used for a murder was actually bought for disputable undercover operation conducted by ATF. The mission was called "Operation Fast & Furious."

The synopsis states that Episode 20 will also see the return of Anthony DiNozzo Sr. as his son Tony and his girlfriend Zoe decide to take their relationship to the next level. DiNozzo Sr. will make an appearance for a special dinner where he gets the chance to meet Zoe.

The abovementioned TV show website has published some photos giving a glimpse of the events of "NCIS" Season 12 Episode 20. Click here to view the photos.

The network has also released a promo video for "No Good Deed." In the video, Tony and Zoe enter the house only to see their oven on fire as DiNozzo Sr. welcomes them. The next shot shows Tony is not very pleased with her dad's return to the town. Tony's father tells Gibbs that Tony doesn't want him around anymore.  Scroll down to watch the video.

"NCIS" Season 12 Episode 20 "No Good Deed" airs April 7, 2015 at 8:00 pm on CBS. Stay tune for more spoilers.