In early 2009, the Purchase Brothers, a Toronto-based film company, released a five-minute film based on "Half-Life 2: Episode One," "". The film combines live-action footage with 3D animation created using the Source SDK. It was well received by Valve. On August 25, 2010 they released a nearly 15-minute long sequel. In late 2010, a trailer for a "Half-Life" inspired independent short film, "Beyond Black Mesa," was released. Directed by Brian Curtin, it follows the character Adrian Shephard. The full short film was released online on January 21, 2011. In December 2008, Valve announced that the two main "Half-Life" games had sold 15.8 million units in retail (9.3m for the first, 6.5m for the second), while the "Half-Life" expansions had sold 1.9 million ("Opposing Force": 1.1 million, "Blue Shift": 800,000) and "Half-Life 2" expansions 1.4 million (all for "Episode One"). Additionally, "The Orange Box", which included "Half-Life 2" and both of its episodic expansions, sold 3 million units at retail by that time. This put franchise sales at 18.8 million full games ("Half-Life": 9.3m, "Half-Life 2:" 9.5m) and 9.3 million expansions ("Opposing Force:" 1.1m, "Blue Shift": 0.8m, "Episode One:" 4.4m, "Episode 2:" 3.0m), as of December 2008. These figures did not account for digital sales. "Half-Life: Counter-Strike" sold 4.2 million units standalone by the same time, while its remake, "Counter-Strike: Source" was bundled with every sold retail copy of "Half-Life 2". "Forbes" reported that, including digital sales, "Half-Life 2" had sold over 12 million copies by February 2011.