Pajama Sam/WMG

The events of Pajama Sam 2 caused the climax of Ouendan 2
When Pajama Sam had accidentally pressed the big red button, it had caused parts of the World Wide Weather to scramble. One of the machines affected was the sun machine, which didn't get its fuel due to the lack of Wing Nut. In result the sun was on the verge of dying. As Pajama Sam was getting Wing Nut back to its place, the both rival Ouendan realized the need to teamwork. The teams cheered and so did the Earth, giving the Sun enough energy to survive longer. Eventually Wing Nut is restored to his place, and the sun was restored to full health.

Pajama Sam's house is a TARDIS
If you think about it, he goes into his closet and he finds the Land of Darkness and he goes into the pantry and finds himself in Level Ate.

Paper knows that the plunger is his, and he is a Jedi
When Sam grabs the plunger from the ski route, Paper knows that it is his plunger but he sensed by using the Force, that the Sam needed it to save the world.

Pajama Sam owns at least two editions of Pajama Man issue #1, each with a different cover
Each cover corresponds to one of the stories in the issue. The edition with Dr. Grime on the cover is by far the rarer of the two.
 * It could also be an in-universe Continuity Reboot.