PLUNGE THROUGH SPACE

Concept art for the DeSoto as a spaceship
Sam & Max: Plunge through space was a sequel to Sam & Max: Hit The Road! developed by Infinite Machine and Lucasarts in 2002 for Xbox, the game would take place as Sam & Max went to look for the statue of liberty, which was stolen by aliens and was being used as a casino, "The Green Mama.". The game never made it far past concepts, as Infinite Machine went bankrupt soon after their first release, leaving the game in the dark, There aren't many, if any, screenshots of the game, so it seems to have never left concepting phase. We may never see any new information ever again.
FREELANCE POLICE

The Freelance Police models, oddly close to Telltale's iterations.
Sam & Max: Freelance Police(the game, dummy) is the SECOND cancelled Lucasarts Sam & Max title, this one's cancellation being due to Lucasarts' adventure games department being shut down, which also cancelled several other games we don't really care about on this site. The game was fairly far into development, and several screenshots exist of the game. It was created in 2003 almost immediately after the cancellation of Plunge Through Space, and featured new 3D graphics, with the same voices as Hit The Road. Lucasarts had this to say during the original cancellation of the game. "After careful evaluation of current market place realities and underlying economic considerations, we've decided that this was not the appropriate time to launch a graphic adventure on the PC."