TNT’s “Falling Skies” picks up three months after last summer’s season finale that saw heroic historian-turned-freedom fighter Tom Mason (Noah Wyle) wander into the belly of a spaceship belonging to aliens who attacked Earth.

The two-hour season premiere (9 p.m. Sunday) begins with a friendly-fire incident involving Tom’s son, Ben, who was rescued from the aliens last season. Flashbacks explain how Tom manages to rejoin the human resistance and include his conversations with an alien leader who uses an enslaved human as his mouthpiece.

The alien orders Tom to lead the humans into a “neutral zone,” not unlike an internment camp, causing Tom and the alien to argue about human history.

“I would be careful to draw too many lessons from the past,” Tom says, “because our history has yet to be written.”

Attempts to draw parallels to life on Earth are few and far between. Mostly, “Falling Skies” concentrates on the freedom fighters’ efforts to blow up alien technology.

The two-hour season premiere addresses the question of what impact the aliens had on Ben in the long term. Could he still be under their control? For that matter, could Tom be compromised by the time he spent on the alien ship? Tom’s oldest son, Hal, doesn’t think so, but troublemaker John Pope isn’t so sure.

The second hour of the season premiere deals with Tom’s own concerns about his memory loss from his time on the alien ship.

“I don’t trust myself and you shouldn’t, either,” Tom says, worrying that the aliens messed with his mind. Turns out they meddled elsewhere.

It’s not deep, meaningful TV, but “Falling Skies” is OK summer entertainment for fans of breezy, things-blow-up-easy programming.