Freezer Portal

From Wefightwiki

The Freezer Portal is a portal disguised as a freezer. If you lock yourself inside of the Freezer Portal, you will get warped to Planet Brr. The Freezer Portal was created by Doctor Stupid so he could get to an alternate lowly-populated planet to make his secret lab. Eventually, the Freezer Portal was lost in the Sewers but got found again by Doctor Bent.