Collins will play Benjamin Hathaway, who served as Commander-in-chief prior to the alien invasion, reports TV Guide.
Hathaway is forced into taking on Earth’s invaders in direct combat and is eager to meet Tom Mason and his fellow rebels in the 2nd Mass.
Collins has previously appeared in The Office, Private Practice and 7th Heaven as well as starring in films including Blood Diamond (2006) and Star Trek: The Motion Picture (1979).
He is expected to make his debut in the fourth episode of Falling Skies’ third season. The drama was officially renewed for a third ten-part season in July.
The series will return to TNT in the US and FX in the UK next year.