The video's narrator claims that an agent guarding Obama during his March 4 speech to the American Israel Public Affairs Committee “could be a shapeshifter alien humanoid working for the powers that be, caught in a high-definition video during an event of the Zionist cabal.”
“I can’t confirm the claims made in this video, but any alleged program to guard the president with aliens or robots would likely have to be scaled back or eliminated in the sequester,” wrote Caitlin Hayden, chief spokeswoman for the National Security Council. “I’d refer you to the Secret Service or Area 51 for more details.”
Wired notes that this isn't an explicit denial. So maybe the conspiracy theorist is right and an "ancient extra-terrestrial race" is "pulling the strings of mankind."
If you follow the narrator's instructions to ignore the low lighting, abrupt angle shifts, and "distortions and image artifacts caused by post-editing zooming,” you might see what he's talking about.
“Even though at first sight he looks like the average Secret Service spook, a series of odd features on his head, face, plus a very strange behavior and creepy movements suggest something else."
The narrator wonders whether that "something else" is the fact that the agent was “shapeshifting into some sort of reptilian, nonhuman form," or perhaps was a "tall, grey bio-android."