Couldn't quite make it to episode 3.

1. Half-Life 2: Episode ThreeHalf-Life 2: Episode Threehttps://giantbomb.com/wiki/Games/Half_Life_2_Episode_ThreeOpens wiki page

I remember when people jokingly said Duke Nukem Forever would come out first...

2. Penny Arcade Adventures: On the Rain-Slick Precipice of Darkness - Episode TwoPenny Arcade Adventures: On the Rain-Slick Precipice of Darkness - Episode Twohttps://giantbomb.com/wiki/Games/Penny_Arcade_Adventures_On_the_Rain_Slick_Precipice_of_Darkness_Episode_TwoOpens wiki page

Another game in the series may happen, although it won't be the same story or style.

3. SiN Episodes: EmergenceSiN Episodes: Emergencehttps://giantbomb.com/wiki/Games/SiN_Episodes_EmergenceOpens wiki page

Originally planned as five episodes.

4. Sonic the Hedgehog 4: Episode ISonic the Hedgehog 4: Episode Ihttps://giantbomb.com/wiki/Games/Sonic_the_Hedgehog_4_Episode_IOpens wiki page