In Escape Mechanism, Marcus is seen checking up on Ryan in his secret chamber, before attending to Brooke in her jail cell and assuring her that he didn't want to incarcerate her in that way, and expressing that he couldn't just let her go, before delivering her a meal. After this he gets back to work, as soon as Judy appears in the Cave.
In a flashback, a younger Marcus is seen being visited by a young Ryan Woods, who has made a discovery in a nearby crater. Marcus eventually gives in, curious at the discovery that Ryan had made and goes with her to the crater, where he sees that she had managed to magnetize a pick-axe to a nearby rock. Back in the present Marcus is forced to begin hypnotizing Brooke. A day before the satellite launch, Marcus is seen being visited by Judy, who is informing him about their plan and making sure that he knew what to do, all the more while expressing his discomfort at carrying out their plan and then later notifying Ryan of the escape pod in her shuttle and begging her to use it if she needed it.
In the next episode; The Client, Marcus is busy working in the cave, while Judy shows him a photo of her son and Brooke back together, after he'd hypnotised Brooke, with him then warning Judy that she'd pay for what she had done and lamenting about his betrayal of Louis' trust. Later in the episode, Marcus shows Judy on his monitor the progress he had been making on their plan.
A Day Off
Marcus next appears in A Day Off, where he is shown expressing clear worry and concern about the specific time that the Client wanted to activate the earthquake at. Later in the same episode, Marcus points out the trigger points, to which the seismic plates would be vulnerable around the beach at the Greenhouse and identifying the point to which he thought would be perfect for their trial run of the earthquake, then assuring Judy that it was 4 miles out into the ocean and then noting the equipment they'd need for it, as well pointing out the fact that they'd be fine in the cave and finally assuring Judy that the students and staff of the Greenhouse wouldn't feel the quake, before beginning the process.
Meant to Be
In Meant to Be Marcus is seen struggling in the cave, as the earthquake continues, later making sure that Ryan was ok in her secret chamber and then later finding out that the Client had been happy about the work that they had managed to achieve, with Marcus expressing his disdain at the fact that they'd nearly destroyed the Greenhouse.
Marcus is next seen in Surfing Lessons where he is seen listening to Judy's talk with the Client and hearing about their next assignment in the Cave, noting that the next spot in which their earthquake should hit would be 90 miles north of the Cave. Marcus expresses his concern at the potential casualties that could be caused through their earthquake, with Client using Marcus' potential fee to reassure him. After this Marcus is seen in The Workshop, where he heads outside of his workshop in order to turn the power back on, after Hayley turned it off as a distraction for Daniel.
Later, Marcus manages to discover Daniel's invisible ink pen that he had dropped while in Marcus' workshop, then projecting it onto a nearby white-board in The Spiral, only to discover his name had been written in the ink. After this he makes use of hand-writing scanning software and discovers that the hand-writing belonged to Hayley, later being seen in Ryan's secret chamber in the Cave, expressing that he now had to deal with Ryan's daughter, before communicating the key-word to both Daniel and Hayley that'd break Brooke out of her trance in secret.
More Than a Hunch
In More Than a Hunch Marcus leaves a letter of resignation for Louis and is later scolded by Judy for doing so and then later nabbing Leo after he makes his way to the outside of the Cave.
A Born Leader
In A Born Leader Marcus assures Leo that he wasn't going to hypnotize him, while he sat in the jail-cell and then takes him to go and see Ryan in her unconscious state, explaining that he had managed to install a escape pod in the space shuttle and that he had rescued her and was keeping her alive, until they had finished their mission, expressing to Leo that he had to break up the heroes, if Hayley was to see her mother alive again.
In the next episode; Kyle Marcus appears during a flashback where is he seen being confronted by Leo, who had mad his way out to the Cave. Marcus reveals the fact that Hayley's mother; Ryan was still alive and tells him that in order to make sure that Ryan stays alive, Leo would need to break up his friends investigation. Later in the episode, Marcus is seen working in the Cave, just as he's asked to open the Cave entrance, then being confronted by Kyle and his men.
He expresses concern at the fact that the Client had hired henchman to watch over him and Judy, before Judy silences him. Finally he's seen caring for the unconscious Ryan in her secret chamber, assuring her that once his mission had been completed he'd be able to wake her up.
During the next episode; Bad Decisions Marcus is busy working in the Cave, just as he is asked by Kyle where Judy was, with him assuring Kyle that Judy would be there any minute. After this Marcus then sees Hayley sneaking in the Cave and makes the excuse to Kyle that he had to go and check the servers. When asked by Hayley where her mom was, he opens up Ryan's secret chamber for her. Later in the episode, after Hayley had been discovered with her mother; Ryan who had actually been alive, Kyle deduces that Marcus had known Ryan was alive.
Marcus is then aggressively told by Kyle that he should of been thankful that he was needed, before then being asked how quickly he could initiate their plan. After being told he'd need to continue working if he wanted to keep Hayley and her mother alive, Marcus begrudgingly goes back to work. Later in the same episode, Kyle tells Marcus to initiate the countdown, before Marcus tells him that Judy hadn't arrived back at that point. But Kyle is quick to beckon him on. Eventually Marcus decides to take a stand and hits Kyle in the face, before being detained by Kyle's guards. Marcus then gets knocked down by Kyle, leaving him in an unconscious state.
Marcus is seen for the last time in Home, where he is seen being taken away by a police offer, due to having still aided Kyle's Greenhouse takeover.