When Marcus was defeated in "Lab Rats" (2012) {Bionic Showdown (#2.15)}, he was near his natural expiration date. Giselle says nothing of correcting this problem after "reassembling him," meaning that Marcus could still reach his termination point at any time (it he hasn't already passed it). Even so, Marcus is an android, and though he can't age to go through puberty, actor Mateus Ward who plays Marcus can and most definitely has - taller, more muscular, deeper voice, and less child-cute.
In Part One, there were twenty ex-soldiers (counting Bob) trapped in Giselle's induction chamber. Now there're only eighteen.
In the 1 hour event "Bionic Action Heroes", Douglas knew that Bionic Android can never really die and reassemble themselves, yet he didn't know that Marcus would and left him under the rubble of his old lair that destroyed him with Giselle having to dig him up. He even shows how he can reassemble himself to Leo and Douglas when his parts get brought into the Lab at the Davenports' House with Douglas having to destroy Marcus with a laser, reducing his parts to a gooish state that can never reassemble.
Why does Marcus' Voice sound Dark and Low Pitched compared to the Previous Episodes that he'd been in?
At the end of the episode, Tasha says that she's pregnant, even though she doesn't seem to have a Large Belly.