In 'Agents of SHIELD' Season 2 Episode 18 titled 'Frenemy of My Enemy,' fans of the Marvel series will see the introduction of suspect and ally Phil Coulson (Clark Gregg) from the agency, who will apparently work to capture the agency.

Christian Today reports that spoilers for 'Agents of SHIELD' Season 2 Episode 18 claimed that in a surprising turn of events, Coulson will work with black ops specialist Grant Ward (Brett Dalton) to defend the S.H.I.E.L.D. destruction by people who want to get rid of Coulson from the office.

The official synopsis of 'Frenemy of My Enemy' reads, "A dangerous new alliance is formed as Coulson and Hunter turn to the last person anyone would expect - Grant Ward! As the war between S.H.I.E.L.D. factions continues, Skye and Lincoln will find themselves drawn into this conflict."

Now the question is whether this would provide Coulson with the advantage to combat the internal forces that are threatening to disturb the organization.

According to the report, the connection between 'Agents of SHIELD' and the forthcoming 'Avengers: Age of Ultron' movie will be confirmed yet again after actress Cobie Smulders teased that she will be returning to play the role of Agent Maria Hill in an one of the upcoming episodes of the TV series.

While speaking at the "Jimmy Kimmel Live" show earlier, the 'How I Met Your Mother' actress reiterated that she will be reprising her role as Agent Hill although she stopped working as an agent to work for the Stark Industries.

Smulders appeared in 'Agents of SHIELD' last when she helped the team prevent Hydra from gaining access to the agency in Season 1 of the TV series.

Apart from the former Agent Hill, one more character from the Marvel Cinematic Universe will appear in 'Agents of SHIELD' Season 3 Episode 19.

According to the spoilers, Dr. List (Henry Goodman) will be seen in the series before the 'Avengers: Age of Ultron' is aired on screen. Last time fans saw the character in 'Captain America: The Winter Soldier.'

Marvel's 'Agents of SHIELD' Season 3 Episode 19 titled 'Frenemy of My Enemy' will air on Tuesdays, April 21 on ABC.