|Non-Canon: Characters and events depicted in this article are non-canon.|
The Past is the Key to the Future is a story in Cartoon Network Action Pack 41.
A doomsday bomb is accidentally detonated by Kevin, the trio goes back in time to find the missing piece to 5 years back. Ben sneaks into the Rust Bucket for his Sumo Slammer cards, which contained the key as Big Chill. Young Ben appears and transforms into Heatblast, who throws flames at him. Big Chill then freezes him and escapes. They return to the present day and Ben disarms the device with the key.