Half-Life 2: Return to Ravenholm (a.k.a Half-Life 2: Episode 4) was supposed to be an extra episode which was being developed by Arkane Studios from 2006 to 2007, before Valve cancelled their episodic model. It was planned to be released after Episode 3 as supplemental content. The episode takes place before the end of Episode 2, but it is unknown if you played as Gordon Freeman (It should be noted that the player is still wearing a HEV suit). Interestingly, the zombies present in the released media do not actually have headcrabs, raising questions about the probability of the episode being canon. Screenshots of the HUD show a meter for "Absorption", which could imply some sort of supernatural ability possessed by the player character. Marc Laidlaw says that it was cancelled by Valve because Headcrabs and Zombies were "pretty much played out", and the episode's creativity was constrained by the fact that it had to take place before the end of Episode 2, as to not advance past where Valve had put the plot of Half-Life.