In Mashable‘s new video series, Behind the Launch, we’re taking cameras behind the scenes at Vungle, an in-app video advertising startup. Today, one of Vungle’s publishers has pulled out, leaving the startup with a very one-sided platform. The Vungle team decides it’s time to refocus, so Colin Behr, head of business development, hits the phones to recruit publishers and build out the business side. “If we don’t move at lightning speed, someone else will be faster,” says founder Jack Smith. “It’s really good to have this paranoia.”

Watch today’s episode to see what happens, and join the conversation on Twitter, #BehindTheLaunch.

Missed earlier episodes? Watch them here!

• Ep. 1: Meet Vungle
• Ep. 2: Bringing in a Closer
• Ep. 3: How to Court Startup Investors
• Ep. 4: A Promising, Yet Controversial Job Candidate

About Vungle

Vungle is a San Francisco-based company that purveys mobile video ads to promote apps. Just last week, Vungle announced that it had raised $2 million from big Silicon Valley and Alley names: Google Ventures, AOL Ventures, Crosslink Capital, Ron Conway’s SV Angel, Dave McClure’s 500 Startups, Charles Hudson’s SoftTechVC’s, Maynard Webb, Scott McNealy and Tim Draper. Vungle also has offices in the UK and Pakistan.

Zain Jaffer, CEO and Co-Founder — A successful and zany entrepreneur since age 15, Zain launched his first Internet company and built-up an impressive list of clients, including Google, Mozilla Firefox, MTV and Hilary Duff, before his 18th birthday. British.

Jack Smith, Co-Founder — Self-described lunatic marketer and hacker. Started his career as a freelance web designer at age 13, founded a video startup, MediaRoots, in college. Met Zain at King’s College London University in 2009. British.

Bryant Chou, CTO — Full stack engineer and software architect with more than five years of experience developing mobile apps. He’s an enthusiastic traveler who’ll share his travel tales with you over a cold beer. American.

Marta Bulaich, Chief Yoga Officer — Marta’s first job was with the masterminds behind the TV infomercial legends Chia Pet and Clapper. After a career of working with various startups and venture capital firm, she came to Vungle to do public relations and center their chi in full lotus. American.

Ben Lindsey, Senior Software Engineer — A veteran of four Silicon Valley startups with experience in Internet advertising, large scale databases and agile programming. When not slinging code, you cam find him cooking organic food, listening to electronica, backpacking around the world or running marathons.

Colin Behr, Director of Business Development — Previously founded an Internet company, CyberPlanet Ltd, with Zain in 2004, and then moved to San Francisco to start another venture. Colin eventually went to University but dropped out after speaking with Zain about his new venture, Vungle.

Ray Myers, Software Engineer — 25-year-old Linux geek who loves robotics and has been programming since he was 7. Ray is a Shotokan karate third-degree Black Belt, but you can usually find him at his computer, trying to make robots bend to his will. American.

Series presented by Internet Explorer

Behind the Launch is presented by Internet Explorer. Learn how IE is building a more beautiful web through hardware accelerated graphics and modern web standards like HTML5. Get IE9 today or download the Windows 8 Consumer Preview, which features the new IE10 to see where we’re headed.

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