'Marvel's Agents of S.H.I.E.L.D.' is returning back on TV this week with the much anticipated Episode 16. After an action packed "Thor" crossover, fans are now looking forward to "Captain America 2" tie-in and Deathlok and agents' combat. The show returns on Tuesday, April 1, 2014 with an episode titled "End of the Beginning." Here are few more spoilers from 'Marvel's Agents of S.H.I.E.L.D.' Episode 16, newly released previews and casting updates. Also, find out details about "Captain America 2" tie-in and season finale airdate. {Warning: Spoilers Alert!]

This article contains major spoilers on "Marvel's Agents of S.H.I.E.L.D." Season 1 Episode 16 "End of the Beginning." Read only if you want to learn more about the episode

'Marvel's Agents of S.H.I.E.L.D.' Episode 16 'End of the Beginning' Spoilers, Previews and Casting Update

Kicking off the segment from where it left, "Marvel's Agents of S.H.I.E.L.D." Episode 16 "End of the Beginning" will focus on Phil Coulson and his team's mission of finding Clairvoyant and identifying its leader. But standing in their way is Marvel's super villain Mike Peterson who recently transformed into a cyborg called Deathlok. He would do anything to protect his master and his identity. Will he kill them all? Joining hands with Agents of S.H.I.E.L.D. in their quest to kill their enemy are Agent Garrett and Agent Triplett.

Recently a new preview clip from "Marvel's Agents of S.H.I.E.L.D." Episode 16 "End of the Beginning" was released on show's official Facebook page, according to Hypable. The preview provides a glimpse at the show's returning episode and features Agent Ward and Agent Triplett while on their hunt of the Clairvoyant. The preview reportedly centers on the "character's insecurities and hunger for vengeance."

Fans can also take a glimpse of the upcoming episode in previously released preview clip featuring an action scene and Deathlok's first appearance. Click HERE to watch the previews as published on Facebook page of the show.

Meanwhile, it has been announced that actor "Twilight" actor Patrick Brennan will be joining the cast to fill the role of a Marvel's super villain Marcus Daniels aka Blackout. Blackout has the power to "suck energy out of anything around him."

The character will debut in "Marvel's Agents of S.H.I.E.L.D." Episode 18 titled "Providence." He will play a major role in the following episode.

Fans are already aware that "Marvel's Agents of S.H.I.E.L.D.'s" returning episode will be the beginning of "Captain America 2" or "Captain America: The Winter Soldier" tie-in. Comicbook.com revealed that post-credits sequence of the Tuesday night's Episode 16 "End of the Beginning" will tie into the events of movie that was recently released. Show's EP Maurissa Tancharoen recommends to watch the episode "till the end" in a tweet posted by her on Twitter on March 30.

Maurissa Tancharoen's tweet read: "Your mission: Watch an all new #AgentsofSHIELD this Tues night.See #CaptainAmerica2 this weekend.Keep watching #AgentsofSHIELD till the end."

Furthermore, "Marvel's Agents of S.H.I.E.L.D." Season 1 Finale airdate has been revealed. According to Screen Rant, 22-part season of the show will feature its finale episode on May 13, 2014. The official title of the episode has not yet been revealed.

Meanwhile, fans know that "Marvel's Agents of S.H.I.E.L.D." is returning on April 1, 2014 to ABC after a brief hiatus. The returning segment, episode 16 "End of the Beginning" will feature Bill Paxton as Agent John Garrett, J August Richards as Mike Peterson or Deathlok, Titus Welliver as Agent Felix Blake, Brad Dourif as Thomas Nash, Saffron Burrows as Victoria Hand, Maximiliano Hernandez as Agent Jasper Sitwell and B.J. Britt as Agent Antoine Triplett as guest stars. The episode will be followed by "Marvel's Agents of S.H.I.E.L.D." Episode 17 titled "Turn, Turn, Turn" on April 8, 2014.

For more spoilers from 'Marvel's Agents of S.H.I.E.L.D.' Season 1, read below:

'Marvel's Agents of S.H.I.E.L.D.' Episode 16 Spoilers: 5 Things to Watch Out for in 'End of the Beginning' Plus 'Captain America 2' Crossover

'Marvel's Agents of S.H.I.EL.D.' Season 1 Episode 16 Spoilers: Airdate and What Happens in 'End of the Beginning'; Agents and Deathlok Combat

'Marvel's Agents of S.H.I.E.L.D.' Season 1 Episode 15 'Yes Man' Spoilers: What Happens in 'Agents of S.H.I.E.L.D.' and 'Thor' Crossover? Where to Watch Live?