The Loch (2017)

S2E1 Memory Blank

After a heated argument, Sam exclaims, "I sometimes wish I had never crossed paths with you," and suddenly, she finds herself in an alternate reality where she and Danny are complete strangers. To make matters worse, since she was the one who inspired Danny to explore the Fenton Portal that granted him his ghost abilities, he now has none! Determined to restore their bond, Sam must remind Danny of their friendship and guide him back to the Fenton Portal for a second mishap, so he can once again transform into Danny Phantom.