The company -- which runs cable networks BET, Comedy Central, MTV and Nickelodeon -- will debut free streaming channels based on those networks Wednesday on PlutoTV, the ad-supported free steaming app that Viacom bought earlier this year for $340 million.

The announcement Monday was made in advance of the company's NewFront, an annual presentation to digital advertisers.

But the channels won't be streaming versions of the networks that people get with a pricey cable subscription.

Viacom described them in three different categories: Flagship Channels that are "curated versions" of the networks, Signature Channels with top programming from each brand, and Pop-Up Channels that binge-deliver a show marathon-style.

"We are thrilled to expand the Pluto TV offering with the addition of Viacom's world-class channel

This is a major step forward in our mission of entertaining the planet,"

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