Hill Harper Hill Harper

Is Calder Michaels good or bad on Covert Affairs? Hill Harper doesn't know himself — and that's just the way he likes it.

After nine years as the good doctor-turned-CSI Sheldon Hawkes on CSI: NY, Harper jumped at the chance to join the USA drama as Calder, an ambitious station chief in Colombia who most definitely got viewers' attention in the Season 4 premiere flash-forward, which features him and Annie (Piper Perabo) opening fire on each other.

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"It's awesome for me," Harper tells TVGuide.com. "I did nine years on CSI: NY, where I played such a nice, nice, nice guy, and everyone loved Dr. Hawkes, so it's nice to dive into a show that's very different from a procedural — it's serialized — and to play a character that has so much edge. On CSI: NY, the audience knew I was a really good guy, and I caught the bad guy. But the audience doesn't know if I'm the bad guy, the good guy, the OK guy on Covert, and I love it."

Indeed, Calder is as gray as they come. Smug, over-confident and with his sights set on bigger things in D.C., he took great umbrage after Annie and Auggie (Christopher Gorham) went rogue and invaded his turf in the premiere to find Teo (Manolo Cardona), the ALC terrorist leader Calder has been tracking and who is Arthur's (Peter Gallagher) secret son. On Tuesday's episode (9/8c, USA), they cross paths again when Annie returns to Colombia with fresh intel on the ALC stronghold, and tries to convince Calder to go in together. Her offer: She'll give him the win for the takedown, if he'll let her have Teo alive, as seen in the exclusive clip below.