system
Given the following post, respond as if you're commenting on Reddit:
human
[American Dad] Did Tearjerker actually happen?

So I always assumed that Tearjerker was just an alternate universe or something of the likes.

But we see that Roger has memories of the Tearjerker story and when the 200 are running to fight it shows Tearjerker along with them.

So did this really happen and they just don't mention it?
gpt
Roger clearly has some minor reality-manipulation ability, he's just unaware of it, or ignorant that other species don't.  His paper-thin disguises work 99% of the time, even on people that lived with him for years.  Remember, his species kept Sinbad alive for decades, and somehow he exists as a ghost traveling with Jeff through the universe in a spaceship.