This Monday, Heroes kicks off its fourth volume of episodes.

The main storyline will revole around Nathan's evil mission to gather up his former friends and allies.

Here are two clips from the episode, titled "A Clear and Present Danger." The first features Peter and Mohinder; while the second focuses on Claire and Parkman:

[video url="http://www.tvfanatic.com/videos/volume-four-clip/" title="Volume Four Clip"] [/video]

[video url="http://www.tvfanatic.com/videos/claire-warns-parkman/" title="Claire Warns Parkman"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.