What is it?
The 2009 American science fiction television show V (Season 1) & V (Season 2).
Here is how Wikipedia describes this TV show:
V is an American science fiction drama television series that ran for two seasons on ABC, from November 3, 2009, to March 15, 2011.
A remake of the 1983 miniseries created by Kenneth Johnson, the new series chronicles the arrival on Earth of a technologically-advanced alien species which ostensibly comes in peace, but actually has sinister motives.
V stars Elizabeth Mitchell and Morena Baccarin, and is executive produced by Scott Rosenbaum, Yves Simoneau, Scott Peters, Steve Pearlman, and Jace Hall.
The series was produced by The Scott Peters Company, HDFilms and Warner Bros. Television. On May 13, 2011, ABC cancelled the series after two seasons.
Giant spaceships appear over 29 major cities throughout the world, and Anna (Morena Baccarin), the beautiful and charismatic leader of the extraterrestrial “Visitors”, declares that they come in peace.
The Visitors claim to only need a small amount of Earth’s resources, in exchange for which they will share their advanced technological and medical knowledge.
As a small number of humans begin to doubt the sincerity of the seemingly benevolent Visitors, FBI counter-terrorism agent Erica Evans (Elizabeth Mitchell) discovers that the aliens are actually reptilian humanoids wearing pseudo-human skin, who have spent decades infiltrating human governments, businesses, and religious institutions, and are now in the final stages of their plan to take over the Earth.
Erica joins the resistance movement, which includes Ryan (Morris Chestnut), a Visitor sleeper agent who over time developed human emotions and now wants to save humanity.
Their rebellion becomes a part of a larger “Fifth Column” movement of both humans and Visitors opposed to Anna’s vague but seemingly menacing plans for Earth and humanity, but their efforts are challenged as the Visitors have won favor among the people of Earth by curing a variety of diseases and have recruited Earth’s youth – including Erica’s son Tyler (Logan Huffman) – to serve them unknowingly as spies.