Travel Channel has acquired docuseries “First Ascent” and will debut it Friday.A NatGeo Intl. and Sender Films co-prod, show examines mountaineers who push their vertical skills to the limit. Travel Channel acquired the show from Shankly Intl. Distribution. Series, exec produced by Leon Logothetis, David Brenner, Peter Mortimer and Nick Rosen, has been licensed in more than 100 countries.