If the characters of Falling Skies believed their problems with the enemy mole were over, they were far from right.

Although it was believed that 'Evil Hal' was the informant and that removing the alien bug from his system would put an end to the problem, the events of "The Pickett Line" proved otherwise.

While Lourdes (Seychelle Gabriel) may have revealed herself to be part of the mole problem considering she killed President Hathaway (Stephen Collins) and was being used as a host by numerous alien bugs. However, Lourdes and Hal's actions may not make either of them the solitary mole, cautions Connor Jessup (Ben Mason), according to TV Line.

"It seems like it would be an easy out, if it was just Hal," Jessup said before "The Pickett Line" aired. "And it's not necessarily a choice between 'Was it Hal, wasn't it Hal?' There could be more options that we just don't know about yet."

In the meantime, Tom (Noah Wyle) has been captured by skitters and separated from his sons who are currently heading towards Anne (Moon Bloodgood) and Lexi's last known position. As the series heads into the last three episodes of the season, this weeks "Strange Brew" may reveal a lot about the plans of both the Espheni and the Volm.

However, the most disturbing part of the promo video is what appears to be a clone of Tom, which you can see around 13 seconds in. If that's actually what happens, Charleston is in for quite a bit more trouble, which can be added onto the activation of the Espheni grid and the questions about the Volm's counter-weapon.

"It was exciting - my favorite episode that we've shot so far on our show, just because it's very different. We kind of knew it was coming, but we didn't know any of the details, or the execution, and it turned out really well," Jessup told TV Line of the upcoming episode. "It gave us all stuff to do that's very different than what we normally do. When we did the table reading, and then we started shooting it, we all looked at each other and said, 'People are going to like this episode.'"

Find out about the mole, a possible Tom clone, and the alien's plans in "Strange Brew" on TNT this Sunday at 10 p.m.

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Falling skies